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148-608: See text Spondylus is a genus of bivalve molluscs , the only genus in the family Spondylidae . They are known in English as spiny oysters or thorny oysters (although they are not, in fact, true oysters , but are related to scallops). The many species of Spondylus vary considerably in appearance. They are grouped in the same superfamily as the scallops . They are not closely related to true oysters (family Ostreidae ); however, they do share some habits such as cementing themselves to rocks rather than attaching themselves by

296-423: A byssus . The two halves of their shells are joined with a ball-and-socket type of hinge, rather than with a toothed hinge as is more common in other bivalves. They also still retain vestigial anterior and posterior auricles ("ears", triangular shell flaps) along the hinge line, a characteristic feature of scallops, although not of oysters. As is the case in all scallops, Spondylus spp. have multiple eyes around

444-537: A constitutional monarch from Europe. When no member of a European royal house desired the position, Iturbide himself was declared Emperor Agustín I. The United States was the first country to recognize Mexico's independence, sending an ambassador to the court and sending a message to Europe via the Monroe Doctrine not to intervene in Mexico. The emperor's rule was short (1822–1823) and he was overthrown by army officers in

592-484: A major conflict with the Catholic Church and Catholic guerrilla armies when he strictly enforced anticlerical articles of the 1917 Constitution which ended with an agreement. Although the constitution prohibited the reelection of the president, Obregón wished to run again and the constitution was amended to allow non-consecutive re-election and won the 1928 elections but was assassinated by a Catholic activist, causing

740-492: A decade of civil war, the "wind that swept Mexico." The Mexican Revolution was a decade-long transformational conflict. It began with scattered uprisings against President Díaz after the fraudulent 1910 election, his resignation in May 1911, demobilization of rebel forces, an interim presidency of a member of the old guard and the democratic election of a rich, civilian landowner, Francisco I. Madero in fall 1911. In February 1913 ,

888-407: A function of elevation. This gives Mexico one of the world's most diverse weather systems. Maritime air masses bring seasonal precipitation from May until August. Many parts of Mexico, particularly the north, have a dry climate with only sporadic rainfall, while parts of the tropical lowlands in the south average more than 2,000 mm (78.7 in) of annual precipitation. For example, many cities in

1036-407: A genus is determined by taxonomists . The standards for genus classification are not strictly codified, so different authorities often produce different classifications for genera. There are some general practices used, however, including the idea that a newly defined genus should fulfill these three criteria to be descriptively useful: Moreover, genera should be composed of phylogenetic units of

1184-643: A later homonym of a validly published name is a nomen illegitimum or nom. illeg. ; for a full list refer to the International Code of Nomenclature for algae, fungi, and plants and the work cited above by Hawksworth, 2010. In place of the "valid taxon" in zoology, the nearest equivalent in botany is " correct name " or "current name" which can, again, differ or change with alternative taxonomic treatments or new information that results in previously accepted genera being combined or split. Prokaryote and virus codes of nomenclature also exist which serve as

1332-621: A long time and redescribed as new by a range of subsequent workers, or if a range of genera previously considered separate taxa have subsequently been consolidated into one. For example, the World Register of Marine Species presently lists 8 genus-level synonyms for the sperm whale genus Physeter Linnaeus, 1758, and 13 for the bivalve genus Pecten O.F. Müller, 1776. Within the same kingdom, one generic name can apply to one genus only. However, many names have been assigned (usually unintentionally) to two or more different genera. For example,

1480-627: A military coup d'état overthrew Madero's government, with the support of the U.S., resulting in Madero's murder by agents of Federal Army General Victoriano Huerta . During the Revolution, the U.S. Republican administration of Taft supported the Huerta coup against Madero, but when Democrat Woodrow Wilson was inaugurated as president in March 1913, Wilson refused to recognize Huerta's regime and allowed arms sales to

1628-454: A natural southern border between Mexico and Guatemala. The climate of Mexico is varied due to the country's size and topography. Tropic of Cancer effectively divides the country into temperate and tropical zones. Land north of the Tropic of Cancer experiences cooler temperatures during the winter months. South of the Tropic of Cancer, temperatures are fairly constant year-round and vary solely as

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1776-520: A new Constitution of 1857 , separating Church and State, stripping the Church and the military of their special privileges ( fueros ); mandating the sale of Church-owned property and sale of indigenous community lands, and secularizing education. Conservatives revolted, touching off civil war between rival Liberal and Conservative governments (1858–1861). The Liberals defeated the Conservative army on

1924-502: A new generation of leaders. But his announcement set off a frenzy of political activity, including the unlikely candidacy of the scion of a rich landowning family, Francisco I. Madero . Madero won a surprising amount of political support when Díaz changed his mind and ran in the election, jailing Madero. The September centennial celebration of independence was the last celebration of the Porfiriato . The Mexican Revolution starting in 1910 saw

2072-548: A peaceful political solution, but the coalition splintered, plunging Mexico again into a civil war. Constitutionalist general Pancho Villa , commander of the Division of the North, broke with Carranza and allied with Zapata. Carranza's best general Alvaro Obregón defeated Villa, his former comrade-in-arms in the Battle of Celaya in 1915, and Villa's northern forces melted away Carranza became

2220-448: A plurality of around 38% and did not have a legislative majority. During the twenty-first century, Mexico has contended with high crime rates , bureaucratic corruption , narcotrafficking , and a stagnant economy. Many state-owned industrial enterprises were privatized starting in the 1990s with neoliberal reforms, but Pemex , the state-owned petroleum company is only slowly being privatized, with exploration licenses being issued. In

2368-539: A political crisis of succession. Calles could not become president again, so he sought to set up a structure to manage presidential succession, founding the Institutional Revolutionary Party , which went on to dominate Mexico for the rest of the 20th century. Despite not holding the presidency, Calles remained the key political figure during the period known as the Maximato (1929–1934), that ended during

2516-491: A population of almost 130 million, it is the 10th most populous country and has the most Spanish speakers in the world. Mexico is a constitutional republic comprising 31 states and Mexico City , its capital and largest city , which is among the world's most populous metropolitan areas . The country borders the United States to the north; as well as Guatemala and Belize to the southeast. It has maritime borders with

2664-402: A push against government corruption, the ex-CEO of Pemex, Emilio Lozoya Austin , was arrested in 2020. After founding the new political party MORENA , Andrés Manuel López Obrador (commonly known as AMLO) won the 2018 presidential election with over 50% of the vote. His political coalition, led by his left-wing party founded after the 2012 elections, included parties and politicians from across

2812-409: A reference for designating currently accepted genus names as opposed to others which may be either reduced to synonymy, or, in the case of prokaryotes, relegated to a status of "names without standing in prokaryotic nomenclature". An available (zoological) or validly published (botanical) name that has been historically applied to a genus but is not regarded as the accepted (current/valid) name for

2960-595: A shift towards neoliberal policies, exemplified by the signing of the North American Free Trade Agreement (NAFTA) in 1994, amidst unrest in Chiapas . Mexico is a newly industrialized and developing country , with the world's 12th-largest economy by nominal GDP and 12th-largest by PPP . Mexico ranks first in the Americas and seventh in the world by the number of UNESCO World Heritage Sites . It

3108-462: A signatory of the Plan of Iguala that achieved independence, became president in a disputed election. During his short term in office, from April to December 1829, he abolished slavery. His Conservative vice president, former Royalist General Anastasio Bustamante , led a coup against him and Guerrero was judicially murdered . Mexico's ability to maintain its independence and establish a viable government

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3256-680: A similar manner to gold nuggets, copper hatches, coca, salt, red pepper, and cotton cloth. The use of Spondylus shells is what led to an economy of sorts in the Central Andes and led to the development of a merchant class, "mercardes", in different cultures within the Central Andes. This caused the development of different styles of trade that went through evolutionary changes throughout pre-Columbian times. These are reciprocity (home based), reciprocity (boundary), down-the-line trade, central place redistribution, central place market exchange, emissary trading, and port of trade. These modes of trade dictate

3404-520: A system of parallel voting that includes plurality and proportional representation . The Chamber of Deputies has 500 deputies. Of these, 300 are elected by plurality vote in single-member districts (the federal electoral districts ) and 200 are elected by proportional representation with closed party lists for which the country is divided into five electoral constituencies. The Senate comprises 128 senators: 64 (two for each state and two for Mexico City) are elected by plurality vote in pairs, 32 are

3552-427: A taxon; however, the names published in suppressed works are made unavailable via the relevant Opinion dealing with the work in question. In botany, similar concepts exist but with different labels. The botanical equivalent of zoology's "available name" is a validly published name . An invalidly published name is a nomen invalidum or nom. inval. ; a rejected name is a nomen rejiciendum or nom. rej. ;

3700-455: A total of c. 520,000 published names (including synonyms) as at end 2019, increasing at some 2,500 published generic names per year. "Official" registers of taxon names at all ranks, including genera, exist for a few groups only such as viruses and prokaryotes, while for others there are compendia with no "official" standing such as Index Fungorum for fungi, Index Nominum Algarum and AlgaeBase for algae, Index Nominum Genericorum and

3848-872: Is a member of United Nations , the G20 , the Organisation for Economic Co-operation and Development (OECD), the World Trade Organization (WTO), the Asia-Pacific Economic Cooperation forum, the Organization of American States , Community of Latin American and Caribbean States , and the Organization of Ibero-American States . Mēxihco is the Nahuatl term for the heartland of the Aztec Empire , namely

3996-604: Is also a great representation of the relationship between the Aztec empire and nature. To Aztec groups and peoples’, Spondylus was a gift from the deities to be celebrated. Certain Spondylus groups were formed as a result of when and where they may be found seasonally and tend to connect a particular group of Spondylus to specific religious symbols such as the Fertility goddess, the Moon goddess,

4144-810: Is also one of the world's 17 megadiverse countries , ranking fifth in natural biodiversity . It is a major tourist destination: as of 2022, it is the sixth most-visited country in the world , with 42.2 million international arrivals. Mexico's large economy and population, global cultural influence, and steady democratization make it a regional and middle power , increasingly identifying as an emerging power . Mexico has made significant political and socioeconomic gains in recent decades. However, as with much of Latin America , Mexico continues to struggle with poverty , systemic corruption , and extensive crime . Since 2006, an ongoing conflict between drug trafficking syndicates has led to over 127,000 deaths. Mexico

4292-684: Is considered one of the six independent cradles of civilization , this era saw the origin of distinct cultural traits such as religious and symbolic traditions, maize cultivation, artistic and architectural complexes as well as a vigesimal (base 20) numeric system that spread from the Mexican cultures to the rest of the Mesoamerican cultural area. In this period, villages became more dense in terms of population, becoming socially stratified with an artisan class, and developing into chiefdoms . The most powerful rulers had religious and political power, organizing

4440-596: Is discouraged by both the International Code of Zoological Nomenclature and the International Code of Nomenclature for algae, fungi, and plants , there are some five thousand such names in use in more than one kingdom. For instance, A list of generic homonyms (with their authorities), including both available (validly published) and selected unavailable names, has been compiled by the Interim Register of Marine and Nonmarine Genera (IRMNG). The type genus forms

4588-574: Is fished primarily for its adductor muscle, or "callus", which is a high-value foodstuff. Some Mediterranean species are edible and are commonly consumed, with S. gaederopus in particular being popular in Sardinia . Tropical species, however, tend to bioaccumulate saxitoxin . The Romans ate Spondylus species. Macrobius in Saturnalia III.13 describes a dinner party in 63 BCE in which there were two courses of Spondylus . In addition to its significance in

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4736-405: Is highly variable. To add to this, while some shallow-water species are extremely common, at least two deep-water species are known from a single specimen, while a third (S. gravis) was only identified in the late 1900s. At least another common species (S. regius) has a different shell when it grows in deep water. See also: Tikod amo , an undescribed species Genus The composition of

4884-438: Is home of 10–12% of the world's biodiversity. Mexico ranks first in biodiversity in reptiles with 707 known species, second in mammals with 438 species , fourth in amphibians with 290 species, and fourth in flora, with 26,000 different species. Mexico is also considered the second country in the world in ecosystems and fourth in overall species. About 2,500 species are protected by Mexican legislation. In 2002 , Mexico had

5032-454: Is incompatible with agriculture due to aridity, soil, or terrain. In 2018, an estimated 54.9% of land is agricultural; 11.8% is arable; 1.4% is in permanent crops; 41.7% is permanent pasture; and 33.3% is forest. Mexico is irrigated by several rivers, with the longest being the Rio Grande , which serves as a natural eastern border with the United States. The Usumacinta River in turn, serves as

5180-552: Is now referred to as the Mexican Dirty War . In the 1980s the first cracks emerged in the PRI's complete political dominance. In Baja California , the PAN candidate was elected as governor. When De la Madrid chose Carlos Salinas de Gortari as the candidate for the PRI, and therefore a foregone presidential victor, Cuauhtémoc Cárdenas , son of former President Lázaro Cárdenas , broke with

5328-570: Is responsible for executing and enforcing the law and has the power to veto bills. The highest organ of the judicial branch of government is the Supreme Court of Justice , the national supreme court , which has eleven judges appointed by the President and approved by the Senate. The Supreme Court of Justice interprets laws and judges cases of federal competency. Other institutions of the judiciary are

5476-460: Is somewhat arbitrary. Although all species within a genus are supposed to be "similar", there are no objective criteria for grouping species into genera. There is much debate among zoologists about whether enormous, species-rich genera should be maintained, as it is extremely difficult to come up with identification keys or even character sets that distinguish all species. Hence, many taxonomists argue in favor of breaking down large genera. For instance,

5624-474: Is the type species , and the generic name is permanently associated with the type specimen of its type species. Should the specimen turn out to be assignable to another genus, the generic name linked to it becomes a junior synonym and the remaining taxa in the former genus need to be reassessed. In zoological usage, taxonomic names, including those of genera, are classified as "available" or "unavailable". Available names are those published in accordance with

5772-636: Is the world's 13th largest country by total area . It has coastlines on the Pacific Ocean and Gulf of California , as well as the Gulf of Mexico and Caribbean Sea , the latter two forming part of the Atlantic Ocean . Within these seas are about 6,000 km (2,317 sq mi) of islands (including the remote Pacific Guadalupe Island and the Revillagigedo Islands ). Almost all of Mexico lies in

5920-454: The 2024 presidential election in a landslide and upon taking office in October became the first woman to lead the country in Mexico's history. She was sworn in as Mexico's president on 1 October 2024. Mexico is located between latitudes 14° and 33°N , and longitudes 86° and 119°W in the southern portion of North America, with a total area of 1,972,550 km (761,606 sq mi),

6068-587: The Aegean Sea , but were transported far into the center of the continent. In the LBK and Lengyel cultures , Spondylus shells from the Aegean Sea were worked into bracelets and belt buckles. Over time styles changed with the middle Neolithic favouring generally larger barrel-shaped beads and the late Neolithic smaller favoring flatter and disk-shaped beads. Significant finds of jewelry made from Spondylus shells were made at

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6216-584: The Archdiocese of Mexico in 1546, with the archbishop as the head of the ecclesiastical hierarchy. Castilian Spanish was the language of rulers. The Catholic faith was the only one permitted, with non-Catholics and Catholics (excluding Indians) holding unorthodox views being subject to the Mexican Inquisition , established in 1571. Spanish military forces, sometimes accompanied by native allies, led expeditions to conquer territory or quell rebellions through

6364-635: The Constitution to allow the Mexican Army, Air Force or Navy to collaborate with the United Nations in peacekeeping missions , or to provide military help to countries that officially ask for it. The Mexican Federal Police was dissolved in 2019 by a constitutional amendment during the administration of President López Obrador and the Mexican National Guard established, amalgamating units of

6512-859: The Cordillera Neo-Volcánica , the Gulf Coastal Plain , the Southern Highlands, and the Yucatán Peninsula . An important geologic feature of the Yucatán peninsula is the Chicxulub crater , the scientific consensus is that the Chicxulub impactor was responsible for the Cretaceous–Paleogene extinction event . Although Mexico is large (a little over 2,000 mi (3,219 km) in length from its farthest land points), much of its land mass

6660-871: The Council of the Indies based in Spain to oversee State power in its overseas territories; in New Spain the crown established a high court in Mexico City, the Real Audiencia ('royal audience' or 'royal tribunal'), and then in 1535 created the Viceroyalty of New Spain . The viceroy was the highest official of the State. In the religious sphere, the Diocese of Mexico was created in 1530 and elevated to

6808-762: The Federal Electoral Tribunal , collegiate, unitary, and district tribunals, and the Council of the Federal Judiciary. Three parties have historically been the dominant parties in Mexican politics: the Institutional Revolutionary Party (PRI), a catch-all party and member of the Socialist International that was founded in 1929 to unite all the factions of the Mexican Revolution and held an almost hegemonic power in Mexican politics since then;

6956-621: The International Code of Zoological Nomenclature ; the earliest such name for any taxon (for example, a genus) should then be selected as the " valid " (i.e., current or accepted) name for the taxon in question. Consequently, there will be more available names than valid names at any point in time; which names are currently in use depending on the judgement of taxonomists in either combining taxa described under multiple names, or splitting taxa which may bring available names previously treated as synonyms back into use. "Unavailable" names in zoology comprise names that either were not published according to

7104-799: The International Plant Names Index for plants in general, and ferns through angiosperms, respectively, and Nomenclator Zoologicus and the Index to Organism Names for zoological names. Totals for both "all names" and estimates for "accepted names" as held in the Interim Register of Marine and Nonmarine Genera (IRMNG) are broken down further in the publication by Rees et al., 2020 cited above. The accepted names estimates are as follows, broken down by kingdom: The cited ranges of uncertainty arise because IRMNG lists "uncertain" names (not researched therein) in addition to known "accepted" names;

7252-472: The Mexican peso crisis , requiring a $ 50 billion IMF bailout. Major macroeconomic reforms were started by Zedillo, and the economy rapidly recovered and growth peaked at almost 7% by the end of 1999. After 71 years of rule, the incumbent PRI lost the 2000 presidential election to Vicente Fox of the opposing conservative National Action Party (PAN). In the 2006 presidential election , Felipe Calderón from

7400-794: The National Action Party (PAN), a conservative party founded in 1939 and belonging to the Christian Democrat Organization of America ; and the Party of the Democratic Revolution (PRD) a left-wing party, founded in 1989 as the successor of the coalition of socialists and liberal parties. The foreign relations of Mexico are directed by the President of Mexico and managed through the Ministry of Foreign Affairs . The principles of

7548-759: The North American Plate , with small parts of the Baja California peninsula on the Pacific and Cocos Plates . Geophysically , some geographers include the territory east of the Isthmus of Tehuantepec (around 12% of the total) within Central America. Geopolitically , however, Mexico is entirely considered part of North America, along with Canada and the United States. The majority of Mexican central and northern territories are located at high altitudes, and as such

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7696-425: The Pacific Ocean to the west, the Caribbean Sea to the southeast, and the Gulf of Mexico to the east. Human presence in Pre-Columbian Mexico dates back to 8,000 BC as one of six cradles of civilization . Mesoamerica hosted civilizations including the Olmec , Maya , Zapotec , Teotihuacan , and Purepecha . Aztec domination of the area preceded Spanish conquest of the Aztec Empire , which established

7844-440: The Plan of Casa Mata . After the forced abdication of the monarch, Central America and Chiapas left the union to form the Federal Republic of Central America . In 1824, the First Mexican Republic was established. Former insurgent General Guadalupe Victoria became the first president of the republic — the first of many army generals to hold the presidency. In 1829, former insurgent general and fierce Liberal Vicente Guerrero ,

7992-416: The Seven Years' War . It created a standing military, increased coastal fortifications, and expanded the northern presidios and missions into Alta California . The volatility of the urban poor in Mexico City was evident in the 1692 riot in the Zócalo. The riot over the price of maize escalated to a full-scale attack on the seats of power, with the viceregal palace and the archbishop's residence attacked by

8140-433: The Spanish Empire in 1821 and became a sovereign state the Intendency came to be known as the State of Mexico , with the new country being named after its capital: Mexico City . The country's official name has changed as the form of government has changed. The declaration of independence signed on 6 November 1813 by the deputies of the Congress of Anáhuac called the territory América Septentrional (Northern America);

8288-440: The Valley of Mexico and surrounding territories, with its people being known as the Mexica . It is generally believed that the toponym for the valley was the origin of the primary ethnonym for the Aztec Triple Alliance , but it may have been the other way around. In the colonial era (1521–1821) when Mexico was known as New Spain this central region became the Intendency of Mexico . After New Spain achieved independence from

8436-570: The Varna Necropolis . During the late Neolithic the use of Spondylus in grave goods appears to have been limited to women and children. S. crassisquama is found off the coast of Colombia and Ecuador and has been important to Andean peoples since pre-Columbian times, serving as both an offering to the fertility goddess Pachamama and as currency. In fact, much like in Europe, the trade in Spondylus shells also reached far and wide, as pre-Hispanic Ecuadorian peoples traded them with peoples as far north as present-day Mexico and as far south as

8584-479: The Yucatán Peninsula ), have a yearly median temperature between 24 and 28 °C (75.2 and 82.4 °F). Temperatures here remain high throughout the year, with only a 5 °C (9 °F) difference between winter and summer median temperatures. The Pacific coast is subject to natural hazards such as tsunamis and both Mexican coasts with the exception of the south coast of the Bay of Campeche and northern Baja California are vulnerable to serious hurricanes during

8732-422: The foreign policy are constitutionally recognized in the Article 89, Section 10, which include: respect for international law and legal equality of states , their sovereignty and independence , trend to non-interventionism in the domestic affairs of other countries, peaceful resolution of conflicts , and promotion of collective security through active participation in international organizations . Since

8880-419: The nomenclature codes , which allow each species a single unique name that, for animals (including protists ), plants (also including algae and fungi ) and prokaryotes ( bacteria and archaea ), is Latin and binomial in form; this contrasts with common or vernacular names , which are non-standardized, can be non-unique, and typically also vary by country and language of usage. Except for viruses ,

9028-404: The platypus belongs to the genus Ornithorhynchus although George Shaw named it Platypus in 1799 (these two names are thus synonyms ) . However, the name Platypus had already been given to a group of ambrosia beetles by Johann Friedrich Wilhelm Herbst in 1793. A name that means two different things is a homonym . Since beetles and platypuses are both members of the kingdom Animalia,

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9176-443: The pre-Columbian times, Spondylus crassiquama was also an important part of Aztec culture. Spondylus uses amongst Aztecs included: art, jewelry, statues, religious motifs, and at times, as currency. One example of Spondylus used in art is the double-headed serpent that may be seen amongst images on the right of the page. As stated above, Spondylus held immense religious value amongst Aztec culture pre-columbian times and

9324-460: The 1821 Plan of Iguala also used América Septentrional. On two occasions (1821–1823 and 1863–1867), the country was known as Imperio Mexicano ( Mexican Empire ). All three federal constitutions (1824, 1857, and 1917, the current constitution) used the name Estados Unidos Mexicanos —or the variant Estados-Unidos Mexicanos , all of which have been translated as "United Mexican States". The phrase República Mexicana , "Mexican Republic",

9472-446: The 1824 constitution and promulgating the Seven Laws , which placed power in his hands. As a result, civil war spread across the country. Three new governments declared independence: the Republic of Texas , the Republic of the Rio Grande and the Republic of Yucatán . The largest blow to Mexico was the U.S. invasion of Mexico in 1846 in the Mexican–American War . Mexico lost much of its sparsely populated northern territory, sealed in

9620-486: The 1848 Treaty of Guadalupe Hidalgo . Despite that disastrous loss, Santa Anna returned to the presidency yet again before being ousted and exiled in the Liberal Revolution of Ayutla . The overthrow of Santa Anna and the establishment of a civilian government by Liberals allowed them to enact laws that they considered vital for Mexico's economic development. The Liberal Reform attempted to modernize Mexico's economy and institutions along liberal principles. They promulgated

9768-456: The 1920 presidential election. Since Carranza could not run for re-election, he chose a civilian to succeed him, intending to remain the power behind the presidency. Obregón and two other Sonoran revolutionary generals drew up the Plan of Agua Prieta , overthrowing Carranza, who died fleeing Mexico City in 1920. General Adolfo de la Huerta became interim president, followed by the election of General Álvaro Obregón . The first quarter-century of

9916-421: The 1930s, the Estrada Doctrine has served as a crucial complement to these principles. Mexico is a founding member of several international organizations, most notably the United Nations, the Organization of American States , the Organization of Ibero-American States , the OPANAL and the CELAC . In 2008, Mexico contributed over 40 million dollars to the United Nations regular budget. In addition, it

10064-511: The Aztec Empire began in February 1519 when Hernán Cortés founded the Spanish city of Veracruz . The 1521 capture of Tenochtitlan and posterior founding of the Spanish capital Mexico City on its ruins was the beginning of a 300-year-long colonial era during which Mexico was known as Nueva España ( New Spain ). Two factors made Mexico a jewel in the Spanish Empire: the existence of large, hierarchically organized Mesoamerican populations that rendered tribute and performed obligatory labor and

10212-476: The Central Andes stems from supply and demand. There was a great demand for Spondylus shells due to the "fetishistic needs to the south". Even today, there are collectors of Spondylus shells, and a commercial market exists for them. Additionally, some species (especially S. americanus ) sometimes are found in the saltwater aquariums. S. limbatus was commonly ground for mortar in Central America, giving raise to its junior synonym, " S. calcifer" . Spondylus

10360-449: The Constitutionalists. Wilson ordered troops to occupy the strategic port of Veracruz in 1914, which was lifted. A coalition of anti-Huerta forces in the North, the Constitutional Army led by Governor of Coahuila Venustiano Carranza , and a peasant army in the South under Emiliano Zapata defeated the Federal Army in 1914, leaving only revolutionary forces. Following the revolutionaries' victory against Huerta, they sought to broker

10508-440: The Crown's monopoly of revenue, only two ports were open to foreign trade—Veracruz on the Atlantic (connecting to Spain ) and Acapulco on the Pacific (connecting to the Philippines ). Among the best-known pirate attacks are the 1663 Sack of Campeche and 1683 Attack on Veracruz . Of greater concern to the crown was the issue of foreign invasion, especially after Britain seized in 1762 the Spanish ports of Havana and Manila in

10656-578: The Epi-Classic, Nahua peoples began moving south into Mesoamerica from the North, and became politically and culturally dominant in central Mexico, as they displaced speakers of Oto-Manguean languages . During the early post-classic era (ca. 1000–1519 AD), Central Mexico was dominated by the Toltec culture, Oaxaca by the Mixtec , and the lowland Maya area had important centers at Chichén Itzá and Mayapán . Toward

10804-691: The Federal Police, Military Police, and Naval Police. As of 2022, the National Guard is estimated at 110,000. López Obrador has increasingly used military forces for domestic law enforcement, particularly against drug cartels. There have been serious abuses of power reported in security operations in the southern part of the country and in indigenous communities and poor urban neighborhoods. The National Human Rights Commission has had little impact in reversing this trend, engaging mostly in documentation but failing to use its powers to issue public condemnations to

10952-642: The French invaders and Liberalism became synonymous with patriotism. The Mexican Army that had its roots in the colonial royal army and then the army of the early republic was destroyed and new military leaders had emerged from the War of the Reform and the conflict with the French, most notably Porfirio Díaz , a hero of the Cinco de Mayo , who now sought civilian power and challenged Juárez on his re-election in 1867. Díaz then rebelled but

11100-479: The Mexican government encouraged Anglo-American immigration into present-day Texas, a region that bordered that United States. Mexico by law was a Catholic country; the Anglo-Americans were primarily Protestant English speakers from the southern United States. Some brought their black slaves, which after 1829 was contrary to Mexican law. In 1835, Santa Anna sought to centralize government rule in Mexico, suspending

11248-523: The Mexican revolution met at a constitutional convention to draft the Constitution of 1917 , which was ratified in February 1917. The Constitution empowered the government to expropriate resources including land, gave rights to labor, and strengthened anticlerical provisions of the 1857 Constitution. With amendments, it remains the governing document of Mexico. It is estimated that the revolutionary war killed 900,000 people out of Mexico's 15 million population at

11396-582: The National Guard, which was formed in 2019 from the disbanded Federal Police and military police of the Army and Navy. Figures vary on personnel, but as of are approximately 223,000 armed forces personnel (160,000 Army; 8,000 Air Force; 55,000 Navy, including about 20,000 Marines); approximately 100,000 National Guard (2021). Government expenditures on the military are a small proportion of GDP: 0.7% of GDP (2021 est.), 0.6% of GDP (2020). The Mexican Armed Forces maintain significant infrastructure, including facilities for

11544-475: The PAN was declared the winner, with a very narrow margin (0.58%) over leftist politician Andrés Manuel López Obrador of the Party of the Democratic Revolution (PRD). López Obrador, however, contested the election and pledged to create an "alternative government". After twelve years, in the 2012 presidential election , the PRI again won the presidency with the election of Enrique Peña Nieto . However, he won with

11692-450: The PRI and challenged Salinas in the 1988 elections. In 1988 there was massive electoral fraud , with results showing that Salinas had won the election by the narrowest percentage ever. There were massive protests in Mexico City over the stolen election. Salinas took the oath of office on 1 December 1988. In 1990 the PRI was famously described by Mario Vargas Llosa as the "perfect dictatorship", but by then there had been major challenges to

11840-517: The PRI's hegemony. Salinas embarked on a program of neoliberal reforms that fixed the exchange rate of the peso, controlled inflation, opened Mexico to foreign investment, and began talks with the U.S. and Canada to join their free-trade agreement , which culminated in the North American Free Trade Agreement (NAFTA) on 1 January 1994; the same day, the Zapatista Army of National Liberation (EZLN) in Chiapas began armed peasant rebellion against

11988-611: The Sun god, and the mountain spirits. This led to certain groups of Spondylus being associated with seasonal weather events such as heavy rains or increases in sea temperature along the coast, as those events were closely associated with particular deities or spirits in Aztec culture [1] . Spondylus had several key uses in pre-Columbian Aztec history, most predominantly its importance in jewelry, art, and sculpture. Another use of Spondylus , that had to be executed with extreme detail and precision,

12136-467: The U.S. entered World War I. Although often viewed as an internal conflict, the revolution had significant international elements: Germany attempted to get Mexico to side with it, sending a coded telegram in 1917 to incite war between the U.S. and Mexico, with Mexico to regain the territory it lost in the Mexican-American War but Mexico remained neutral in the conflict. In 1916, the winners of

12284-524: The army for a short period were incorporated as sectors of the single party that dominated Mexican politics from its founding in 1929. Obregón instigated land reform and strengthened the power of organized labor. He gained recognition from the United States and took steps to settle claims with companies and individuals that lost property during the Revolution. He imposed his fellow former Sonoran revolutionary general, Calles, as his successor, prompting an unsuccessful military revolt. As president, Calles provoked

12432-415: The arts and sciences. Díaz ruled with a group of advisors that became known as the científicos ('scientists'). The most influential científico was Secretary of Finance José Yves Limantour . The Porfirian regime was influenced by positivism . They rejected theology and idealism in favor of scientific methods being applied towards national development. An integral aspect of the liberal project

12580-442: The base for higher taxonomic ranks, such as the family name Canidae ("Canids") based on Canis . However, this does not typically ascend more than one or two levels: the order to which dogs and wolves belong is Carnivora ("Carnivores"). The numbers of either accepted, or all published genus names is not known precisely; Rees et al., 2020 estimate that approximately 310,000 accepted names (valid taxa) may exist, out of

12728-460: The battlefield, Lerdo fled from office into exile. After the turmoil in Mexico from 1810 to 1876, the 35-year rule of Liberal General Porfirio Díaz (r.1876–1911) allowed Mexico to rapidly modernize in a period characterized as one of " order and progress ". The Porfiriato was characterized by economic stability and growth, significant foreign investment and influence, an expansion of the railroad network and telecommunications, and investments in

12876-484: The battlefield, but Conservatives sought another solution to gain power via foreign intervention by the French, asking Emperor Napoleon III to place a European monarch as head of state in Mexico. The French Army defeated the Mexican Army and placed Maximilian Habsburg on the newly established throne of Mexico, supported by Mexican Conservatives and propped up by the French Army. The Liberal Republic under Benito Juárez

13024-595: The capabilities to manufacture nuclear weapons, but abandoned this possibility with the Treaty of Tlatelolco in 1968 and pledged to use its nuclear technology only for peaceful purposes. Mexico signed the UN treaty on the Prohibition of Nuclear Weapons . Historically, Mexico has remained neutral in international conflicts, with the exception of World War II . However, in recent years some political parties have proposed an amendment of

13172-464: The central Andes . The Moche people of ancient Peru regarded the sea and animals as sacred; they used Spondylus shells in their art and depicted Spondylus in effigy pots. Spondylus also were harvested from the Gulf of California and traded to tribes throughout Mexico and the American Southwest. Spondylus shells were the driving factor of trade within the Central Andes and were used in

13320-604: The colonial era. Notable Amerindian revolts in sporadically populated northern New Spain include the Chichimeca War (1576–1606), Tepehuán Revolt (1616–1620), and the Pueblo Revolt (1680), the Tzeltal Rebellion of 1712 was a regional Maya revolt. Most rebellions were small-scale and local, posing no major threat to the ruling elites. To protect Mexico from the attacks of English, French, and Dutch pirates and protect

13468-404: The colony of New Spain centered in the former capital, Tenochtitlan (now Mexico City ). The Mexican War of Independence in the early 19th century was followed by political and socioeconomic upheaval. The Mexican–American War resulted in significant territorial losses in 1848. Liberal reforms introduced in the Constitution of 1857 prompted domestic conflict, French intervention , and

13616-668: The construction of large ceremonial centers. The earliest complex civilization in Mexico was the Olmec culture, which flourished on the Gulf Coast from around 1500 BC. Olmec cultural traits diffused through Mexico into other formative-era cultures in Chiapas, Oaxaca, and the Valley of Mexico. In the subsequent pre-classical period , the Maya and Zapotec civilizations developed complex centers at Calakmul and Monte Albán , respectively. During this period

13764-415: The country; temperate humid and sub-humid being found mostly on pastures at an elevation of 1,800 meters and higher in central Mexico and cold climate usually found at an elevation of 3,500 meters and beyond. Most of the country's territory has a temperate to dry climate. Areas south of the Tropic of Cancer with elevations up to 1,000 m (3,281 ft) (the southern parts of both coastal plains as well as

13912-479: The de facto head of Mexico, and the U.S. recognized his government while Zapata's forces in the south reverted to guerrilla warfare. After Pancho Villa was defeated by revolutionary forces in 1915, he led an incursion raid into Columbus, New Mexico , prompting the U.S. to send 10,000 troops led by General John J. Pershing in an unsuccessful attempt to capture Villa. Carranza pushed back against U.S. troops being in northern Mexico. The expeditionary forces withdrew as

14060-563: The design, research, and testing of weapons, vehicles, aircraft, naval vessels, defense systems and electronics; military industry manufacturing centers for building such systems, and advanced naval dockyards that build heavy military vessels and advanced missile technologies. Since the 1990s, when the military escalated its role in the war on drugs , increasing importance has been placed on acquiring airborne surveillance platforms, aircraft, helicopters , digital war-fighting technologies, urban warfare equipment and rapid troop transport. Mexico has

14208-579: The discovery of vast silver deposits in northern Mexico. The Kingdom of New Spain was created from the remnants of the Aztec empire. The two pillars of Spanish rule were the State and the Roman Catholic Church, both under the authority of the Spanish crown. In 1493 the pope had granted sweeping powers to the Spanish monarchy for its overseas empire, with the proviso that the crown spread Christianity in its new realms. In 1524, King Charles I created

14356-662: The edges of their mantle , and they have relatively well-developed nervous systems . Their nervous ganglia are concentrated in the visceral region, with recognisable optic lobes connected to the eyes. The genus Spondylus appeared in the Mesozoic era , and is known in the fossil records from the Triassic Cassian beds in Italy (235 to 232 million years ago) onward. Approximately 40 extinct species are known. Fossils of these molluscs may be found in fossiliferous marine strata all over

14504-658: The end of the post-Classic period, the Aztecs (or Mexica ) established dominance, establishing a political and economic empire based in the city of Tenochtitlan (modern Mexico City ), extending from central Mexico to the border with Guatemala. Although the Spanish Empire had established colonies in the Caribbean starting in 1493 the Spanish first learned of Mexico during the Juan de Grijalva expedition of 1518. The Spanish conquest of

14652-475: The establishment of an Empire , countered by the Republican resistance led by Benito Juárez . The rise of Porfirio Díaz 's dictatorship in the 19th century sparked the Mexican Revolution in 1910, which led to profound changes, such as the 1917 Constitution . Over the 20th century, Mexico experienced significant economic growth ; as well as issues of repression and electoral fraud . The late 20th century saw

14800-777: The extension of the Rocky Mountains from northern North America crossed the country from north to south and a fourth mountain range, the Sierra Madre del Sur , runs from Michoacán to Oaxaca . The Mexican territory is prone to volcanism . Mexico has nine distinct regions: Baja California , the Pacific Coastal Lowlands, the Mexican Plateau , the Sierra Madre Oriental , the Sierra Madre Occidental ,

14948-454: The federal government, which captured a few towns but brought world attention to the situation in Mexico. The armed conflict was short-lived and has continued as a non-violent opposition movement against neoliberalism and globalization . In 1994, following the assassination of the PRI's presidential candidate Luis Donaldo Colosio , Salinas was succeeded by victorious PRI candidate Ernesto Zedillo . Salinas left Zedillo's government to deal with

15096-537: The first minority or first-runner-up (one for each state and one for Mexico City), and 32 are elected by proportional representation from national closed party lists. The executive is the President of the United Mexican States , who is the head of state and government , as well as the commander-in-chief of the Mexican military forces. The President also appoints the Cabinet and other officers. The President

15244-596: The first true Mesoamerican writing systems were developed in the Epi-Olmec and Zapotec cultures. The Mesoamerican writing tradition reached its height in the Classic Maya Hieroglyphic script , the earliest written histories date from this era. The tradition of writing was important after the Spanish conquest in 1521, with indigenous scribes learning to write their languages in alphabetic letters, while also continuing to create pictorial texts. In Central Mexico,

15392-446: The form "author, year" in zoology, and "standard abbreviated author name" in botany. Thus in the examples above, the genus Canis would be cited in full as " Canis Linnaeus, 1758" (zoological usage), while Hibiscus , also first established by Linnaeus but in 1753, is simply " Hibiscus L." (botanical usage). Each genus should have a designated type , although in practice there is a backlog of older names without one. In zoology, this

15540-727: The generic name (or its abbreviated form) still forms the leading portion of the scientific name, for example, Canis lupus lupus for the Eurasian wolf subspecies, or as a botanical example, Hibiscus arnottianus ssp. immaculatus . Also, as visible in the above examples, the Latinised portions of the scientific names of genera and their included species (and infraspecies, where applicable) are, by convention, written in italics . The scientific names of virus species are descriptive, not binomial in form, and may or may not incorporate an indication of their containing genus; for example,

15688-442: The height of the classic period saw the ascendancy of Teotihuacán , which formed a military and commercial empire. Teotihuacan, with a population of more than 150,000 people, had some of the largest pyramidal structures in the pre-Columbian Americas. After the collapse of Teotihuacán around 600 AD, competition ensued between several important political centers in central Mexico such as Xochicalco and Cholula . At this time, during

15836-528: The highest elevations are found at the Trans-Mexican Volcanic Belt which crosses Mexico east to west: Pico de Orizaba (5,700 m or 18,701 ft), Popocatépetl (5,462 m or 17,920 ft) and Iztaccihuatl (5,286 m or 17,343 ft) and the Nevado de Toluca (4,577 m or 15,016 ft). Two mountain ranges known as Sierra Madre Oriental and Sierra Madre Occidental , which are

15984-607: The increase of inequality between urban and rural areas. The Green Revolution , a technological movement that led to a significant worldwide increase in crop production, began in the Yaqui Valley of Sonora in the middle of the 20th century. With robust economic growth, Mexico sought to showcase it to the world by hosting the 1968 Summer Olympics . The government poured huge resources into building new facilities, prompting political unrest among university students and others. Demonstrations in central Mexico City went on for weeks before

16132-431: The indigenous language of Nahuatl . Tequila , the distilled alcoholic drink made from cultivated agave cacti is a major industry. Because of its high biodiversity Mexico has also been a frequent site of bioprospecting by international research bodies. The first highly successful instance was the discovery in 1947 of the tuber " Barbasco " ( Dioscorea composita ) which has a high content of diosgenin , revolutionizing

16280-628: The largest component, with 23,236 ± 5,379 accepted genus names, of which 20,845 ± 4,494 are angiosperms (superclass Angiospermae). By comparison, the 2018 annual edition of the Catalogue of Life (estimated >90% complete, for extant species in the main) contains currently 175,363 "accepted" genus names for 1,744,204 living and 59,284 extinct species, also including genus names only (no species) for some groups. The number of species in genera varies considerably among taxonomic groups. For instance, among (non-avian) reptiles , which have about 1180 genera,

16428-476: The latter, they are protected by spines and a layer of epibionts and, like the former, they can produce pearls . The type of substrate they use depends on the species: many only attach to coral, and the largest diversity of species is found in tropical coral reefs; others, (particularly S. spinosus) however, easily adapt to manufactured structures such as boats, pipes, and docks thereby becoming significant invasive species . Often other species are found attached to

16576-462: The lizard genus Anolis has been suggested to be broken down into 8 or so different genera which would bring its ~400 species to smaller, more manageable subsets. Mexico Mexico , officially the United Mexican States , is a country in the southern portion of North America . Covering 1,972,550 km (761,610 sq mi), it is the world's 13th largest country by area; with

16724-513: The mob. On 16 September 1810, secular priest Miguel Hidalgo y Costilla declared against "bad government" in the small town of Dolores , Guanajuato. This event, known as the Cry of Dolores ( Spanish : Grito de Dolores ) is commemorated each year, on 16 September, as Mexico's independence day. The upheaval in the Spanish Empire that resulted in the independence of most of its New World territories

16872-403: The most (>300) have only 1 species, ~360 have between 2 and 4 species, 260 have 5–10 species, ~200 have 11–50 species, and only 27 genera have more than 50 species. However, some insect genera such as the bee genera Lasioglossum and Andrena have over 1000 species each. The largest flowering plant genus, Astragalus , contains over 3,000 species. Which species are assigned to a genus

17020-428: The name could not be used for both. Johann Friedrich Blumenbach published the replacement name Ornithorhynchus in 1800. However, a genus in one kingdom is allowed to bear a scientific name that is in use as a generic name (or the name of a taxon in another rank) in a kingdom that is governed by a different nomenclature code. Names with the same form but applying to different taxa are called "homonyms". Although this

17168-474: The north like Monterrey , Hermosillo , and Mexicali experience temperatures of 40 °C (104 °F) or more in summer. In the Sonoran Desert temperatures reach 50 °C (122 °F) or more. There are 7 major climate types in Mexico with warm sub-humid climate being coastal up to 900 meters found mostly in the southern region of Mexico; dry and desertic climates being found in the northern half of

17316-478: The planned opening of the games, with the government of Gustavo Díaz Ordaz cracking down. The culmination was the Tlatelolco Massacre , which killed around 300 protesters based on conservative estimates and perhaps as many as 800. Although the economy continued to flourish for some, social inequality remained a factor of discontent. PRI rule became increasingly authoritarian and at times oppressive in what

17464-537: The political spectrum. The coalition also won a majority in both the upper and lower Congress chambers. His success is attributed to the country's opposing political forces exhausting their chances as well as AMLO's adoption of a moderate discourse with a focus on reconciliation. The first confirmed case of COVID-19 in Mexico occurred on 28 February 2020. The COVID-19 vaccination in Mexico began in December 2020. Claudia Sheinbaum , López Obrador's political successor, won

17612-520: The politics for the next 25 years, often known as the "Age of Santa Anna", until his overthrow in 1855. Mexico also contended with indigenous groups that controlled the territory that Mexico claimed in the north. For example, the Comanche controlled a huge territory in sparsely populated central and northern Texas. Wanting to stabilize and develop that area — and as few people from central Mexico had chosen to resettle to this remote and hostile territory —

17760-489: The post-revolutionary period (1920–1946) was characterized by revolutionary generals serving as Presidents of Mexico , including Álvaro Obregón (1920–24), Plutarco Elías Calles (1924–28), Lázaro Cárdenas (1934–40), and Manuel Avila Camacho (1940–46). The post-revolutionary project of the Mexican government sought to bring order to the country, end military intervention in politics, and create organizations of interest groups. Workers, peasants, urban office workers, and even

17908-481: The presidency of Lázaro Cárdenas , who expelled Calles from the country and implemented many economic and social reforms. This included the Mexican oil expropriation in March 1938, which nationalized the U.S. and Anglo-Dutch oil company known as the Mexican Eagle Petroleum Company , which would result in the creation of the state-owned Pemex . Cárdenas's successor, Manuel Ávila Camacho (1940–1946)

18056-401: The production of synthetic hormones in the 1950s and 1960s and eventually leading to the invention of combined oral contraceptive pills . The United Mexican States are a federation whose government is representative , democratic, and republican based on a presidential system according to the 1917 Constitution . The Constitution establishes three levels of government: the federal Union,

18204-526: The provisions of the ICZN Code, e.g., incorrect original or subsequent spellings, names published only in a thesis, and generic names published after 1930 with no type species indicated. According to "Glossary" section of the zoological Code, suppressed names (per published "Opinions" of the International Commission of Zoological Nomenclature) remain available but cannot be used as the valid name for

18352-417: The same kind as other (analogous) genera. The term "genus" comes from Latin genus , a noun form cognate with gignere ('to bear; to give birth to'). The Swedish taxonomist Carl Linnaeus popularized its use in his 1753 Species Plantarum , but the French botanist Joseph Pitton de Tournefort (1656–1708) is considered "the founder of the modern concept of genera". The scientific name (or

18500-408: The scientific epithet) of a genus is also called the generic name ; in modern style guides and science, it is always capitalised. It plays a fundamental role in binomial nomenclature , the system of naming organisms , where it is combined with the scientific name of a species : see Botanical name and Specific name (zoology) . The rules for the scientific names of organisms are laid down in

18648-974: The second fastest rate of deforestation in the world, second only to Brazil. It had a 2019 Forest Landscape Integrity Index mean score of 6.82/10, ranking it 63rd globally out of 172 countries. According to SGI there is Deforestation and soil erosion especially in rural areas of Mexico. In the 2022 report it was noted environmental protection laws have improved in major cities but remain unenforced or unregulated in rural regions. In Mexico, 170,000 square kilometers (65,637 sq mi) are considered "Protected Natural Areas". These include 34 biosphere reserves (unaltered ecosystems), 67 national parks , 4 natural monuments (protected in perpetuity for their aesthetic, scientific or historical value), 26 areas of protected flora and fauna, 4 areas for natural resource protection (conservation of soil, hydrological basins, and forests) and 17 sanctuaries (zones rich in diverse species). Plants indigenous to Mexico are grown in many parts of

18796-515: The shells of other species, perhaps the most common being found attached to the genus Malleus . Archaeological evidence indicates that people in Neolithic Europe were trading the shells of S. gaederopus to make bangles and other ornaments throughout much of the Neolithic period. The main period of Neolithic use appears to have been from around 5350 to 4200 BC. The shells were harvested from

18944-497: The specific name particular to the wolf. A botanical example would be Hibiscus arnottianus , a particular species of the genus Hibiscus native to Hawaii. The specific name is written in lower-case and may be followed by subspecies names in zoology or a variety of infraspecific names in botany . When the generic name is already known from context, it may be shortened to its initial letter, for example, C. lupus in place of Canis lupus . Where species are further subdivided,

19092-412: The standard format for a species name comprises the generic name, indicating the genus to which the species belongs, followed by the specific epithet, which (within that genus) is unique to the species. For example, the gray wolf 's scientific name is Canis lupus , with Canis ( Latin for 'dog') being the generic name shared by the wolf's close relatives and lupus (Latin for 'wolf') being

19240-624: The state governments, and the municipal governments. The federal legislature is the bicameral Congress of the Union , composed of the Senate of the Republic and the Chamber of Deputies . The Congress makes federal law , declares war, imposes taxes, approves the national budget and international treaties, and ratifies diplomatic appointments. The federal Congress, as well as the state legislatures, are elected by

19388-412: The summer and fall. Although low-lying areas north of the Tropic of Cancer are hot and humid during the summer, they generally have lower yearly temperature averages (from 20 to 24 °C or 68.0 to 75.2 °F) because of more moderate conditions during the winter. Mexico ranks fourth in the world in biodiversity and is one of the 17 megadiverse countries . With over 200,000 different species, Mexico

19536-712: The support of Canada, Italy, Pakistan and other nine countries, which form a group informally called the Coffee Club . The Mexican Armed Forces are administered by the Secretariat of National Defense ( Secretaria de Defensa Nacional , SEDENA). There are two branches: the Mexican Army (which includes the Mexican Air Force ), and the Mexican Navy . The Secretariat of Public Security and Civil Protection has jurisdiction over

19684-403: The taxon is termed a synonym ; some authors also include unavailable names in lists of synonyms as well as available names, such as misspellings, names previously published without fulfilling all of the requirements of the relevant nomenclatural code, and rejected or suppressed names. A particular genus name may have zero to many synonyms, the latter case generally if the genus has been known for

19832-510: The time. Consolidating power, President Carranza had peasant leader Emiliano Zapata assassinated in 1919. Carranza had gained the support of the peasantry during the Revolution, but once in power, he did little to institute land reform, which had motivated many to fight in the Revolution. Carranza returned some confiscated land to their original owners. President Carranza's best general, Obregón, served briefly in his administration but returned to his home state of Sonora to position himself to run in

19980-566: The values quoted are the mean of "accepted" names alone (all "uncertain" names treated as unaccepted) and "accepted + uncertain" names (all "uncertain" names treated as accepted), with the associated range of uncertainty indicating these two extremes. Within Animalia, the largest phylum is Arthropoda , with 151,697 ± 33,160 accepted genus names, of which 114,387 ± 27,654 are insects (class Insecta). Within Plantae, Tracheophyta (vascular plants) make up

20128-429: The virus species " Salmonid herpesvirus 1 ", " Salmonid herpesvirus 2 " and " Salmonid herpesvirus 3 " are all within the genus Salmonivirus ; however, the genus to which the species with the formal names " Everglades virus " and " Ross River virus " are assigned is Alphavirus . As with scientific names at other ranks, in all groups other than viruses, names of genera may be cited with their authorities, typically in

20276-413: The way that the Spondylus shells are traded, as well as who is benefiting the most from the trades. Modes such as central place redistribution require the entity that is the central place to be the one that gains the most benefit from the trade, and modes such as emissary trading and port of trade are the modes that started the "mercardes" class within the Central Andes. The value of Spondylus shells in

20424-403: The world and integrated into their national cuisines. Some of Mexico's native culinary ingredients include maize, tomato, beans, squash, chocolate, vanilla , avocado , guava , chayote , epazote , camote , jícama , nopal , zucchini , tejocote , huitlacoche , sapote , mamey sapote , and a great variety of chiles , such as the habanero and the jalapeño . Most of these names come from

20572-669: The world. For example, they are present in Cretaceaous rocks in the Fort Worth Formation of Texas , and in the Trent River Formation of Vancouver Island , as well as in other parts of North America. Spiny oysters are found in all subtropical and (especially) tropical seas, usually close to the coasts. Spondylus are filter feeders . The adults live cemented to hard substrates, a characteristic they share, by convergent evolution, with true oysters and jewel boxes . Like

20720-757: Was a government in internal exile, but with the end of the Civil War in the United States in April 1865, the Reunified U.S. government began aiding the Mexican Republic. Two years later, the French Army withdrew its support, but Maximilian remained in Mexico. Republican forces captured him and he was executed. The "Restored Republic" saw the return of Juárez, "the personification of the embattled republic," as president. The Conservatives had been not only defeated militarily but also discredited politically for their collaboration with

20868-471: Was crushed by Juárez. Having won re-election, Juárez died in office in July 1872, and Liberal Sebastián Lerdo de Tejada became president, declaring a "religion of the state" for the rule of law, peace, and order. When Lerdo ran for re-election, Díaz rebelled against the civilian president, issuing the Plan of Tuxtepec . Díaz had more support and waged guerrilla warfare against Lerdo. On the verge of Díaz's victory on

21016-625: Was due to Napoleon Bonaparte 's invasion of Spain in 1808. Hidalgo and some of his soldiers were eventually captured, Hidalgo was defrocked, and they were executed by firing squad on 31 July 1811. The first 35 years after Mexico's independence were marked by political instability and the changing of the Mexican state from a transient monarchy to a fragile federated republic. There were military coups d'état, foreign invasions, ideological conflict between Conservatives and Liberals , and economic stagnation . Former Royal Army General Agustín de Iturbide became regent, as newly independent Mexico sought

21164-427: Was in question. Spain attempted to reconquer its former colony during the 1820s but eventually recognized its independence. France attempted to recoup losses it claimed for its citizens during Mexico's unrest and blockaded the Gulf Coast during the so-called Pastry War of 1838–1839. General Antonio López de Santa Anna emerged as a national hero because of his role in both these conflicts; Santa Anna came to dominate

21312-403: Was more moderate, and relations between the U.S. and Mexico vastly improved during World War II , when Mexico was a significant ally. From 1946 the election of Miguel Alemán , the first civilian president in the post-revolutionary period, Mexico embarked on an aggressive program of economic development, known as the Mexican miracle , which was characterized by industrialization, urbanization, and

21460-451: Was secular education. The Díaz government led a protracted conflict against the Yaqui that culminated with the forced relocation of thousands of Yaqui to Yucatán and Oaxaca. As the centennial of independence approached, Díaz gave an interview where he said he was not going to run in the 1910 elections, when he would be 80. Political opposition had been suppressed and there were few avenues for

21608-573: Was the only Latin American member of the Organisation for Economic Co-operation and Development since it joined in 1994 until Chile gained full membership in 2010. Mexico is considered a regional power hence its presence in major economic groups such as the G8+5 and the G-20 . Since the 1990s Mexico has sought a reform of the United Nations Security Council and its working methods with

21756-399: Was to create breathtaking masks, vests, and other items individuals would use to express how important or wealthy they were in life and death. Having the most beautiful Spondylus pieces, meant that individual had immense power within the community. Spondylidae taxonomy has undergone many revisions, mostly due to the fact that identification is traditionally based on the shell alone, and this

21904-490: Was used in the 1836 Constitutional Laws . The earliest human artifacts in Mexico are chips of stone tools found near campfire remains in the Valley of Mexico and radiocarbon-dated to circa 10,000 years ago. Mexico is the site of the domestication of maize, tomato, and beans , which produced an agricultural surplus. This enabled the transition from paleo-Indian hunter-gatherers to sedentary agricultural villages beginning around 5000 BC. The formative period of Mesoamerica

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