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127-746: The Cycladic Massif is a Miocene high-pressure orogenic segment located in the Aegean Sea underlying the Cyclades . Initially, the Massif was a single island which began to break apart due to the tectonic activities of the subduction of the African Plate under the Eurasian Plate during the late Miocene Epoch. This tectonics article is a stub . You can help Misplaced Pages by expanding it . Miocene As Earth went from

254-542: A broader aridification trend. The EMCI ended 18 million years ago, giving way to the Middle Miocene Warm Interval (MMWI), the warmest part of which was the MMCO that began 16 million years ago. As the world transitioned into the MMCO, carbon dioxide concentrations varied between 300 and 500 ppm. Global annual mean surface temperature during the MMCO was about 18.4 °C. MMCO warmth was driven by

381-529: A clade of large terrestrial predatory crocodyliformes distantly related to modern crocodilians, from which they likely diverged over 180 million years ago, are known from the Miocene of South America. The last Desmostylians thrived during this period before becoming the only extinct marine mammal order. The pinnipeds , which appeared near the end of the Oligocene, became more aquatic. A prominent genus

508-669: A clandestine organization. José López Rega organized the Argentine Anticommunist Alliance (AAA) to fight against them and the People's Revolutionary Army (ERP). Perón died in July 1974 and was succeeded by his wife, who signed a secret decree empowering the military and the police to "annihilate" the left-wing subversion, stopping ERP's attempt to start a rural insurgence in Tucumán province. Isabel Perón

635-570: A cooler, drier climate. C 4 grasses, which are able to assimilate carbon dioxide and water more efficiently than C 3 grasses, expanded to become ecologically significant near the end of the Miocene between 6 and 7 million years ago, although they did not expand northward during the Late Miocene. The expansion of grasslands and radiations among terrestrial herbivores correlates to fluctuations in CO 2 . One study, however, has attributed

762-684: A critical role in the party, died of cancer in 1952. As the economy continued to tank, Perón started losing popular support, and came to be seen as a threat to the national process. The Navy took advantage of Perón's withering political power, and bombed the Plaza de Mayo in 1955. Perón survived the attack, but a few months later, during the Liberating Revolution coup, he was deposed and went into exile in Spain. The new head of State, Pedro Eugenio Aramburu , proscribed Peronism and banned

889-463: A final heart attack on Monday, 1 July 1974, and died at 13:15. He was 78 years old. After his death, Isabel Perón , his wife and vice president, succeeded him in office. During her presidency, a military junta, along with the Peronists' far-right fascist faction, once again became the de facto head of state . Isabel Perón served as President of Argentina from 1974 until 1976, when she was ousted by

1016-486: A good analogue for future warmer climates caused by anthropogenic global warming , with this being especially true of the global climate during the Middle Miocene Climatic Optimum (MMCO), because the last time carbon dioxide levels were comparable to projected future atmospheric carbon dioxide levels resulting from anthropogenic climate change was during the MMCO. The Ross Sea margin of

1143-435: A good model for a "living fossil". Eucalyptus fossil leaves occur in the Miocene of New Zealand , where the genus is not native today, but have been introduced from Australia . Both marine and continental fauna were fairly modern, although marine mammals were less numerous. Only in isolated South America and Australia did widely divergent fauna exist. In Eurasia, genus richness shifted southward to lower latitudes from

1270-551: A left-wing Peronist, who took office on 25 May 1973. A month later, in June, Perón returned from Spain. One of Cámpora's first presidential actions was to grant amnesty to members of organizations that had carried out political assassinations and terrorist attacks, and to those who had been tried and sentenced to prison by judges. Cámpora's months-long tenure in government was beset by political and social unrest. Over 600 social conflicts, strikes , and factory occupations took place within

1397-598: A major expansion of Antarctic glaciers. This severed the connection between the Indian Ocean and the Mediterranean Sea and formed the present land connection between Afro-Arabia and Eurasia. The subsequent uplift of mountains in the western Mediterranean region and a global fall in sea levels combined to cause a temporary drying up of the Mediterranean Sea (known as the Messinian salinity crisis ) near

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1524-480: A major expansion of grass-grazer ecosystems . Herds of large, swift grazers were hunted by predators across broad sweeps of open grasslands , displacing desert, woodland, and browsers . The higher organic content and water retention of the deeper and richer grassland soils , with long-term burial of carbon in sediments, produced a carbon and water vapor sink. This, combined with higher surface albedo and lower evapotranspiration of grassland, contributed to

1651-747: A military coup d'état led by General Arturo Rawson toppled the democratically elected government of Ramón Castillo . Under pressure from the United States, later Argentina declared war on the Axis Powers (on 27 March 1945, roughly a month before the end of World War II in Europe ). During the Rawson dictatorship a relatively unknown military colonel named Juan Perón was named head of the Labour Department. Perón quickly managed to climb

1778-480: A presidential decree settled the country's name as "Argentine Republic", and that year's constitutional amendment ruled all the names since 1810 as legally valid. In English , the country was traditionally called "the Argentine", mimicking the typical Spanish usage la Argentina and perhaps resulting from a mistaken shortening of the fuller name 'Argentine Republic'. 'The Argentine' fell out of fashion during

1905-618: A proposal known as the Inca plan of 1816, which proposed that the United Provinces of the Río de la Plata (Present Argentina) should be a monarchy, led by a descendant of the Inca . Juan Bautista Túpac Amaru (half-brother of Túpac Amaru II ) was proposed as monarch. Some examples of those who supported this proposal were Manuel Belgrano , José de San Martín and Martín Miguel de Güemes . The Congress of Tucumán finally decided to reject

2032-613: A second term . With the economy beginning to decline in 1995, and with increasing unemployment and recession, the UCR, led by Fernando de la Rúa , returned to the presidency in the 1999 elections . De la Rúa left Menem's economic plan in effect despite the worsening crisis, which led to growing social discontent. Massive capital flight from the country was responded to with a freezing of bank accounts , generating further turmoil. The December 2001 riots forced him to resign. Congress appointed Eduardo Duhalde as acting president, who revoked

2159-602: A significant drop in atmospheric carbon dioxide levels. Both continental and oceanic thermal gradients in mid-latitudes during the Early Miocene were very similar to those in the present. Global cooling caused the East Asian Summer Monsoon (EASM) to begin to take on its modern form during the Early Miocene. From 22.1 to 19.7 Ma, the Xining Basin experienced relative warmth and humidity amidst

2286-700: A significant local decline along the northeastern coast of Australia during the Tortonian, most likely due to warming seawater. Cetaceans attained their greatest diversity during the Miocene, with over 20 recognized genera of baleen whales in comparison to only six living genera. This diversification correlates with emergence of gigantic macro-predators such as megatoothed sharks and raptorial sperm whales . Prominent examples are O. megalodon and L. melvillei . Other notable large sharks were O. chubutensis , Isurus hastalis , and Hemipristis serra . Crocodilians also showed signs of diversification during

2413-467: A single month. Even though far-left terrorist organisations had suspended their armed struggle, their joining with the participatory democracy process was interpreted as a direct threat by the Peronist right-wing faction. Amid a state of political, social, and economic upheaval, Cámpora and Vice President Vicente Solano Lima resigned in July 1973, calling for new elections, but this time with Perón as

2540-414: A system of social assistance for the most vulnerable sectors of society. The economy began to decline in 1950 due in part to government expenditures and the protectionist economic policies. He also engaged in a campaign of political suppression. Anyone who was perceived to be a political dissident or potential rival was subject to threats, physical violence and harassment. The Argentine intelligentsia ,

2667-588: A zone of low rainfall in the Late Miocene. The Indian Plate continued to collide with the Eurasian Plate , creating new mountain ranges and uplifting the Tibetan Plateau , resulting in the rain shadowing and aridification of the Asian interior. The Tian Shan experienced significant uplift in the Late Miocene, blocking westerlies from coming into the Tarim Basin and drying it as a result. At

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2794-550: Is plateado and prateado , although argento for 'silver' and argentado for 'covered in silver' exist in Spanish. Argentina was first associated with the silver mountains legend , widespread among the first European explorers of the La Plata Basin . The first written use of the name in Spanish can be traced to La Argentina , a 1602 poem by Martín del Barco Centenera describing the region. Although "Argentina"

2921-538: Is a regional power , and retains its historic status as a middle power in international affairs. A major non-NATO ally of the United States, Argentina is a developing country with the second-highest HDI (human development index) in Latin America after Chile . It maintains the second-largest economy in South America, and is a member of G-15 and G20 . Argentina is also a founding member of

3048-532: Is a country in the southern half of South America . Argentina covers an area of 2,780,400 km (1,073,500 sq mi), making it the second-largest country in South America after Brazil , the fourth-largest country in the Americas , and the eighth-largest country in the world. It shares the bulk of the Southern Cone with Chile to the west, and is also bordered by Bolivia and Paraguay to

3175-682: Is of particular interest to geologists and palaeoclimatologists because major phases of the geology of the Himalaya occurred during that epoch, affecting monsoonal patterns in Asia, which were interlinked with glacial periods in the northern hemisphere. The Miocene faunal stages from youngest to oldest are typically named according to the International Commission on Stratigraphy : Regionally, other systems are used, based on characteristic land mammals; some of them overlap with

3302-632: The Cordobazo and the Rosariazo . The terrorist guerrilla organization Montoneros kidnapped and executed Aramburu. The newly chosen head of government, Alejandro Agustín Lanusse , seeking to ease the growing political pressure, allowed Héctor José Cámpora to become the Peronist candidate instead of Perón. Cámpora won the March 1973 election , issued pardons for condemned guerrilla members, and then secured Perón's return from his exile in Spain. On

3429-624: The Bombing of Plaza de Mayo in 1955. The Trelew massacre of 1972, the actions of the Argentine Anticommunist Alliance commencing in 1973, and Isabel Perón 's "annihilation decrees" against left-wing guerrillas during Operativo Independencia (Operation Independence) in 1975, are also possible events signaling the beginning of the Dirty War. Onganía shut down Congress, banned all political parties, and dismantled student and worker unions. In 1969, popular discontent led to two massive protests:

3556-738: The Centralists and the Federalists —a move that would define Argentina's first decades of independence. The Assembly of the Year XIII appointed Gervasio Antonio de Posadas as Argentina's first Supreme Director . On 9 July 1816, the Congress of Tucumán formalized the Declaration of Independence , which is now celebrated as Independence Day, a national holiday. One year later General Martín Miguel de Güemes stopped royalists on

3683-709: The Charrúa , Minuane and Guaraní in the northeast, with slash and burn semisedentary existence; the advanced Diaguita sedentary trading culture in the northwest, which was conquered by the Inca Empire around 1480; the Toconoté and Hênîa and Kâmîare in the country's centre, and the Huarpe in the centre-west, a culture that raised llama cattle and was strongly influenced by the Incas. Europeans first arrived in

3810-833: The Falkland Islands , South Georgia and the South Sandwich Islands , the Southern Patagonian Ice Field , and a part of Antarctica . The earliest recorded human presence in modern-day Argentina dates back to the Paleolithic period. The Inca Empire expanded to the northwest of the country in Pre-Columbian times. The country has its roots in Spanish colonization of the region during the 16th century. Argentina rose as

3937-521: The Laborioust candidate. The Labour Party (later renamed Justicialist Party ), the most powerful and influential party in Argentine history, came into power with the rise of Juan Perón to the presidency in 1946. He nationalized strategic industries and services, improved wages and working conditions, paid the full external debt and claimed he achieved nearly full employment . He pushed Congress to enact women's suffrage in 1947, and developed

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4064-508: The Macri Government introduced neoliberal austerity measures intended to tackle inflation and overblown public deficits. Under Macri's administration, economic recovery remained elusive with GDP shrinking 3.4%, inflation totaling 240%, billions of US dollars issued in sovereign debt, and mass poverty increasing by the end of his term. He ran for re-election in 2019 but lost by nearly eight percentage points to Alberto Fernández ,

4191-559: The Middle Miocene Climate Transition (MMCT). Abrupt increases in opal deposition indicate this cooling was driven by enhanced drawdown of carbon dioxide via silicate weathering. The MMCT caused a sea surface temperature (SST) drop of approximately 6 °C in the North Atlantic. The drop in benthic foraminiferal δ O values was most noticeable in the waters around Antarctica, suggesting cooling

4318-519: The Southern Cone . The Dirty War involved state terrorism in Argentina and elsewhere in the Southern Cone against political dissidents, with military and security forces employing urban and rural violence against left-wing guerrillas, political dissidents, and anyone believed to be associated with socialism or somehow contrary to the neoliberal economic policies of the regime. Victims of

4445-743: The United Nations , World Bank , World Trade Organization , Mercosur , Community of Latin American and Caribbean States and the Organization of Ibero-American States . The description of the region by the word Argentina has been found on a Venetian map in 1536. In English, the name Argentina comes from the Spanish language ; however, the naming itself is not Spanish, but Italian . Argentina ( masculine argentino ) means in Italian '(made) of silver, silver coloured', derived from

4572-670: The absolutist monarchy that ruled the country. As in the rest of Spanish America, the overthrow of Ferdinand VII during the Peninsular War created great concern. Beginning a process from which Argentina was to emerge as successor state to the Viceroyalty, the 1810 May Revolution replaced the viceroy Baltasar Hidalgo de Cisneros with the First Junta , a new government in Buenos Aires made up from locals. In

4699-560: The carbon cycle occurred approximately 6 Ma, causing continental carbon reservoirs to no longer expand during cold spells, as they had done during cold periods in the Oligocene and most of the Miocene. At the end of the Miocene, global temperatures rose again as the amplitude of Earth's obliquity increased, which caused increased aridity in Central Asia. Around 5.5 Ma, the EAWM underwent a period of rapid intensification. Life during

4826-520: The neo-Keynesian economic policies laid by Duhalde, Kirchner ended the economic crisis attaining significant fiscal and trade surpluses, and rapid GDP growth. Under his administration, Argentina restructured its defaulted debt with an unprecedented discount of about 70% on most bonds, paid off debts with the International Monetary Fund , purged the military of officers with dubious human rights records, nullified and voided

4953-529: The 1916 election . He enacted social and economic reforms and extended assistance to small farms and businesses. Argentina stayed neutral during World War I . The second administration of Yrigoyen faced an economic crisis, precipitated by the Great Depression . In 1930, Yrigoyen was ousted from power by the military led by José Félix Uriburu . Although Argentina remained among the fifteen richest countries until mid-century, this coup d'état marks

5080-710: The Central Paratethys, cut off from sources of freshwater input by its separation from the Eastern Paratethys. From 13.36 to 12.65 Ma, the Central Paratethys was characterised by open marine conditions, before the reopening of the Bârlad Strait resulted in a shift to brackish-marine conditions in the Central Paratethys, causing the Badenian-Sarmatian Extinction Event. As a result of the Bârlad Strait's reopening,

5207-837: The Early to the Middle Miocene. Europe's large mammal diversity significantly declined during the Late Miocene. In the Early Miocene, several Oligocene groups were still diverse, including nimravids , entelodonts , and three-toed equids. As in the previous Oligocene Epoch, oreodonts were still diverse, only to disappear in the earliest Pliocene. During the later Miocene mammals were more modern, with easily recognizable canids , bears , red pandas , procyonids , equids , beavers , deer , camelids , and whales , along with now-extinct groups like borophagine canids , certain gomphotheres , three-toed horses , and hornless rhinos like Teleoceras and Aphelos . The late Miocene also marks

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5334-720: The East Antarctic Ice Sheet (EAIS) was highly dynamic during the Early Miocene. The Miocene began with the Early Miocene Cool Event (Mi-1) around 23 million years ago, which marked the start of the Early Miocene Cool Interval (EMCI). This cool event occurred immediately after the Oligocene-Miocene Transition (OMT) during a major expansion of Antarctica's ice sheets, but was not associated with

5461-399: The East Asian Winter Monsoon (EAWM) became stronger synchronously with a southward shift of the subarctic front. Greenland may have begun to have large glaciers as early as 8 to 7 Ma, although the climate for the most part remained warm enough to support forests there well into the Pliocene. Zhejiang, China was noticeably more humid than today. In the Great Rift Valley of Kenya , there

5588-415: The Falkland Islands . The United Kingdom dispatched a task force to regain possession. Argentina surrendered on 14 June and its forces were taken home. Street riots in Buenos Aires followed the humiliating defeat and the military leadership stood down. Reynaldo Bignone replaced Galtieri and began to organize the transition to democratic governance. Raúl Alfonsín won the 1983 elections campaigning for

5715-431: The Full Stop and Due Obedience laws, ruled them as unconstitutional, and resumed legal prosecution of the Junta's crimes. He did not run for reelection, promoting instead the candidacy of his wife, senator Cristina Fernández de Kirchner , who was elected in 2007 and reelected in 2011 . Fernández de Kirchner's administration established positive foreign relations with countries such as Venezuela, Iran, and Cuba, while at

5842-439: The Inca plan, creating instead a republican, centralist state. The 1820 Battle of Cepeda , fought between the Centralists and the Federalists, resulted in the end of the Supreme Director rule . In 1826 Buenos Aires enacted another centralist constitution , with Bernardino Rivadavia being appointed as the first president of the country. However, the interior provinces soon rose against him, forced his resignation and discarded

5969-508: The Justicialist Party candidate. President Alberto Fernández and Vice President Cristina Fernández de Kirchner took office in December 2019, just months before the COVID-19 pandemic hit Argentina and among accusations of corruption , bribery and misuse of public funds during Nestor and Cristina Fernández de Kirchner's presidencies . On 14 November 2021, the center-left coalition of Argentina's ruling Peronist party, Frente de Todos (Front for Everyone), lost its majority in Congress, for

6096-490: The Justicialist Party nominee. Perón won the election with his wife Isabel Perón as vice president. Perón's third term was marked by escalating conflict between left and right-wing factions within the Peronist party, as well as the return of armed terror guerrilla groups such as the Guevarist ERP , leftist Peronist Montoneros , and the state-backed far-right Triple A . After a series of heart attacks and signs of pneumonia in 1974, Perón's health deteriorated quickly. He suffered

6223-411: The LMC; extratropical sea surface temperatures dropped substantially by approximately 7–9 °C. 41 kyr obliquity cycles became the dominant orbital climatic control 7.7 Ma and this dominance strengthened 6.4 Ma. Benthic δ O values show significant glaciation occurred from 6.26 to 5.50 Ma, during which glacial-interglacial cycles were governed by the 41 kyr obliquity cycle. A major reorganisation of

6350-405: The Late Cretaceous, are known from the Miocene of Patagonia, represented by the mole-like Necrolestes . The youngest known representatives of metatherians (the broader grouping to which marsupials belong) in Europe, Asia and Africa are known from the Miocene, including the European herpetotheriid Amphiperatherium , the peradectids Siamoperadectes and Sinoperadectes from Asia, and

6477-591: The Late Miocene, the Earth's climate began to display a high degree of similarity to that of the present day . The 173 kyr obliquity modulation cycle governed by Earth's interactions with Saturn became detectable in the Late Miocene. By 12 Ma, Oregon was a savanna akin to that of the western margins of the Sierra Nevada of northern California . Central Australia became progressively drier, although southwestern Australia experienced significant wettening from around 12 to 8 Ma. The South Asian Winter Monsoon (SAWM) underwent strengthening ~9.2–8.5 Ma. From 7.9 to 5.8 Ma,

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6604-402: The Latin argentum for silver. In Italian, the adjective or the proper noun is often used in an autonomous way as a substantive and replaces it and it is said l'Argentina . The name Argentina was probably first given by the Venetian and Genoese navigators, such as Giovanni Caboto . In Spanish and Portuguese, the words for 'silver' are respectively plata and prata and '(made) of silver'

6731-434: The Mediterranean refilled. That event is referred to as the " Zanclean flood ". Also during the early Miocene (specifically the Aquitanian and Burdigalian Stages), the apes first evolved, began diversifying, and became widespread throughout the Old World . Around the end of this epoch, the ancestors of humans had split away from the ancestors of the chimpanzees and had begun following their own evolutionary path during

6858-511: The Miocene Epoch was mostly supported by the two newly formed biomes , kelp forests and grasslands . Grasslands allow for more grazers, such as horses , rhinoceroses , and hippos . Ninety-five percent of modern plants existed by the end of this epoch . Modern bony fish genera were established. A modern-style latitudinal biodiversity gradient appeared ~15 Ma. The coevolution of gritty , fibrous, fire-tolerant grasses and long-legged gregarious ungulates with high-crowned teeth , led to

6985-449: The Miocene. The largest form among them was a gigantic caiman Purussaurus which inhabited South America. Another gigantic form was a false gharial Rhamphosuchus , which inhabited modern age India . A strange form, Mourasuchus also thrived alongside Purussaurus . This species developed a specialized filter-feeding mechanism, and it likely preyed upon small fauna despite its gigantic size. The youngest members of Sebecidae ,

7112-413: The North American Great Plains and in Argentina . The global trend was towards increasing aridity caused primarily by global cooling reducing the ability of the atmosphere to absorb moisture, particularly after 7 to 8 million years ago. Uplift of East Africa in the late Miocene was partly responsible for the shrinking of tropical rain forests in that region, and Australia got drier as it entered

7239-419: The Oligocene through the Miocene and into the Pliocene, the climate slowly cooled towards a series of ice ages . The Miocene boundaries are not marked by distinct global events but by regionally defined transitions from the warmer Oligocene to the cooler Pliocene Epoch. During the Early Miocene, Afro-Arabia collided with Eurasia, severing the connection between the Mediterranean and Indian Oceans, and allowing

7366-529: The Oligocene–Miocene transgression. As the southern Andes rose in the Middle Miocene (14–12 million years ago) the resulting rain shadow originated the Patagonian Desert to the east. Far northern Australia was monsoonal during the Miocene. Although northern Australia is often believed to have been much wetter during the Miocene, this interpretation may be an artefact of preservation bias of riparian and lacustrine plants; this finding has itself been challenged by other papers. Western Australia, like today,

7493-472: The Peronist Carlos Menem won the 1989 election . Soon after, riots forced Alfonsín to an early resignation . Menem embraced and enacted neoliberal policies: a fixed exchange rate , business deregulation , privatizations , and the dismantling of protectionist barriers normalized the economy in the short term. He pardoned the officers who had been sentenced during Alfonsín's government. The 1994 Constitutional Amendment allowed Menem to be elected for

7620-433: The Qiongdongnan Basin in the northern South China Sea indicates the Pearl River was a major source of sediment flux into the sea during the Early Miocene and was a major fluvial system as in the present. During the Oligocene and Early Miocene, the coast of northern Brazil, Colombia, south-central Peru , central Chile and large swathes of inland Patagonia were subject to a marine transgression . The transgressions in

7747-439: The United States government during the Johnson , Nixon , Ford , Carter , and Reagan administrations. The exact chronology of the repression is still debated, yet the roots of the long political war may have started in 1969 when trade unionists were targeted for assassination by Peronist and Marxist paramilitaries. Individual cases of state-sponsored terrorism against Peronism and the left can be traced back even further to

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7874-562: The United States'—led to a near-reinvention of Argentine society and economy that by 1908 had placed the country as the seventh wealthiest developed nation in the world. Driven by this immigration wave and decreasing mortality, the Argentine population grew fivefold and the economy 15-fold: from 1870 to 1910, Argentina's wheat exports went from 100,000 to 2,500,000 t (110,000 to 2,760,000 short tons) per year, while frozen beef exports increased from 25,000 to 365,000 t (28,000 to 402,000 short tons) per year, placing Argentina as one of

8001-423: The activity of the Columbia River Basalts and enhanced by decreased albedo from the reduction of deserts and expansion of forests. Climate modelling suggests additional, currently unknown, factors also worked to create the warm conditions of the MMCO. The MMCO saw the expansion of the tropical climatic zone to much larger than its current size. The July ITCZ, the zone of maximal monsoonal rainfall, moved to

8128-398: The allegiance of escaped Filipinos in San Blas who defected from the Spanish to join the Argentine navy, due to common Argentine and Philippine grievances against Spanish colonization. Jose de San Martin's brother, Juan Fermín de San Martín , was already in the Philippines and drumming up revolutionary fervor prior to this. At a later date, the Argentine sign of Inca origin, the Sun of May

8255-472: The aridity of the former. Unequivocally-recognizable dabbling ducks , plovers , typical owls , cockatoos and crows appear during the Miocene. By the epoch's end, all or almost all modern bird groups are believed to have been present; the few post-Miocene bird fossils which cannot be placed in the evolutionary tree with full confidence are simply too badly preserved, rather than too equivocal in character. Marine birds reached their highest diversity ever in

8382-422: The beginning of the Miocene, the northern margin of the Arabian plate, then part of the African landmass, collided with Eurasia; as a result, the Tethys seaway continued to shrink and then disappeared as Africa collided with Eurasia in the Turkish – Arabian region. The first step of this closure occurred 20 Ma, reducing water mass exchange by 90%, while the second step occurred around 13.8 Ma, coincident with

8509-400: The border, and the appropriation of the indigenous territories. The first conquest consisted of a series of military incursions into the Pampa and Patagonian territories dominated by the indigenous peoples, distributing them among the members of the Sociedad Rural Argentina , financiers of the expeditions. The conquest of Chaco lasted up to the end of the century, since its full ownership of

8636-444: The constitution. Centralists and Federalists resumed the civil war; the latter prevailed and formed the Argentine Confederation in 1831, led by Juan Manuel de Rosas . During his regime he faced a French blockade (1838–1840), the War of the Confederation (1836–1839), and an Anglo-French blockade (1845–1850), but remained undefeated and prevented further loss of national territory. His trade restriction policies, however, angered

8763-437: The country was slow to meet its original goals of industrialization: after the steep development of capital-intensive local industries in the 1920s, a significant part of the manufacturing sector remained labour-intensive in the 1930s. Between 1878 and 1884, the so-called Conquest of the Desert occurred, with the purpose of tripling the Argentine territory by means of the constant confrontations between natives and Criollos in

8890-460: The course of this epoch . The youngest representatives of Choristodera , an extinct order of aquatic reptiles that first appeared in the Middle Jurassic , are known from the Miocene of Europe, belonging to the genus Lazarussuchus , which had been the only known surviving genus of the group since the beginning of the Eocene. The last known representatives of the archaic primitive mammal order Meridiolestida , which dominated South America during

9017-407: The day Perón returned to Argentina, the clash between Peronist internal factions— right-wing union leaders and left-wing youth from the Montoneros—resulted in the Ezeiza Massacre . Overwhelmed by political violence, Cámpora resigned and Perón won the following September 1973 election with his third wife Isabel as vice-president. He expelled Montoneros from the party and they became once again

9144-580: The death of President Juan Perón in 1974, his widow and vice president, Isabel Perón , ascended to the presidency, before being overthrown in 1976 . The following military junta , which was supported by the United States , persecuted and murdered thousands of political critics, activists, and leftists in the Dirty War , a period of state terrorism and civil unrest that lasted until the election of Raúl Alfonsín as president in 1983 . Argentina

9271-664: The development of pottery , such as the Selk'nam and Yaghan in the extreme south. The second group are advanced hunters and food gatherers which include the Puelche , Querandí and Serranos in the centre-east; and the Tehuelche in the south—all of them conquered by the Mapuche spreading from Chile —and the Kom and Wichi in the north. The last group are farmers with pottery, such as

9398-612: The early to mid Miocene (23–15 Ma). Oceans cooled partly due to the formation of the Antarctic Circumpolar Current , and about 15 million years ago the ice cap in the southern hemisphere started to grow to its present form. The Greenland ice cap developed later, in the Middle Pliocene time, about 3 million years ago. Argentina Argentina , officially the Argentine Republic ,

9525-578: The end of the Miocene due to increased habitat uniformity. The expansion of grasslands in North America also led to an explosive radiation among snakes. Previously, snakes were a minor component of the North American fauna, but during the Miocene, the number of species and their prevalence increased dramatically with the first appearances of vipers and elapids in North America and the significant diversification of Colubridae (including

9652-485: The end of the Miocene. The Paratethys underwent a significant transgression during the early Middle Miocene. Around 13.8 Ma, during a global sea level drop, the Eastern Paratethys was cut off from the global ocean by the closure of the Bârlad Strait, effectively turning it into a saltwater lake. From 13.8 to 13.36 Ma, an evaporite period similar to the later Messinian salinity crisis in the Mediterranean ensued in

9779-637: The enigmatic Saint Bathans Mammal . Microbial life in the igneous crust of the Fennoscandian Shield shifted from being dominated by methanogens to being primarily composed of sulphate-reducing prokaryotes . The change resulted from fracture reactivation during the Pyrenean-Alpine orogeny, enabling sulphate-reducing microbes to permeate into the Fennoscandian Shield via descending surficial waters. Diatom diversity

9906-461: The evolution of both groups into modern representatives. The early Miocene Saint Bathans Fauna is the only Cenozoic terrestrial fossil record of the landmass, showcasing a wide variety of not only bird species, including early representatives of clades such as moa , kiwi and adzebills , but also a diverse herpetofauna of sphenodontians , crocodiles and turtles as well as a rich terrestrial mammal fauna composed of various species of bats and

10033-499: The expansion of grasslands not to a CO 2 drop but to the increasing seasonality and aridity, coupled with a monsoon climate, which made wildfires highly prevalent compared to before. The Late Miocene expansion of grasslands had cascading effects on the global carbon cycle, evidenced by the imprint it left in carbon isotope records. Cycads between 11.5 and 5 million years ago began to rediversify after previous declines in variety due to climatic changes, and thus modern cycads are not

10160-718: The extinction of the last-surviving members of the hyaenodonts . Islands began to form between South and North America in the Late Miocene, allowing ground sloths like Thinobadistes to island-hop to North America. The expansion of silica-rich C 4 grasses led to worldwide extinctions of herbivorous species without high-crowned teeth . Mustelids diversified into their largest forms as terrestrial predators like Ekorus , Eomellivora , and Megalictis and bunodont otters like Enhydriodon and Sivaonyx appeared. Eulipotyphlans were widespread in Europe, being less diverse in Southern Europe than farther north due to

10287-437: The final Messinian Stage (7.5–5.3 Ma) of the Miocene. As in the Oligocene before it, grasslands continued to expand, and forests to dwindle. In the seas of the Miocene, kelp forests made their first appearance and soon became one of Earth's most productive ecosystems. The plants and animals of the Miocene were recognizably modern. Mammals and birds were well established. Whales , pinnipeds , and kelp spread. The Miocene

10414-629: The findings of marine invertebrate fossils of both Atlantic and Pacific affinity in La Cascada Formation . Connection would have occurred through narrow epicontinental seaways that formed channels in a dissected topography . The Antarctic Plate started to subduct beneath South America 14 million years ago in the Miocene, forming the Chile Triple Junction . At first the Antarctic Plate subducted only in

10541-404: The first ballotage in Argentina's history, beating Front for Victory candidate Daniel Scioli and becoming president-elect. Macri was the first democratically elected non- peronist president since 1916 that managed to complete his term in office without being overthrown. He took office on 10 December 2015 and inherited an economy with a high inflation rate and in a poor shape. In April 2016,

10668-652: The first clashes of the Independence War the Junta crushed a royalist counter-revolution in Córdoba , but failed to overcome those of the Banda Oriental , Upper Peru and Paraguay , which later became independent states. The French-Argentine Hippolyte Bouchard then brought his fleet to wage war against Spain overseas and attacked Spanish California , Spanish Peru and Spanish Philippines . He secured

10795-492: The first time in almost 40 years, in midterm legislative elections . The election victory of the center-right coalition, Juntos por el Cambio (Together for Change) limited President Alberto Fernandez's power during his final two years in office. Losing control of the Senate made it difficult for him to make key appointments, including to the judiciary. It also forced him to negotiate with the opposition every initiative he sends to

10922-424: The fixed exchange rate established by Menem, causing many working- and middle-class Argentines to lose a significant portion of their savings. By late 2002, the economic crisis began to recede, but the assassination of two piqueteros by the police caused political unrest, prompting Duhalde to move elections forward. Néstor Kirchner was elected as the new president . On 26 May 2003, he was sworn in. Boosting

11049-498: The government after elected labour movement officials were forcefully replaced by Peronist puppets from the Peronist Party . Reyes was soon arrested on charges of terrorism, though the allegations were never substantiated. Reyes, who was never formally charged, was tortured in prison for five years and only released after the regime's downfall in 1955. Perón managed to get re-elected in 1951 . His wife Eva Perón , who played

11176-464: The human lineage) appeared in Africa at the very end of the Miocene, including Sahelanthropus , Orrorin , and an early form of Ardipithecus ( A. kadabba ). The chimpanzee–human divergence is thought to have occurred at this time. The evolution of bipedalism in apes at the end of the Miocene instigated an increased rate of faunal turnover in Africa. In contrast, European apes met their end at

11303-585: The interchange of fauna between Eurasia and Africa, including the dispersal of proboscideans and hominoids into Eurasia. During the late Miocene, the connections between the Atlantic and Mediterranean closed, causing the Mediterranean Sea to almost completely evaporate. This event is referred to as the " Messinian salinity crisis ". Then, at the Miocene–Pliocene boundary, the Strait of Gibraltar opened, and

11430-511: The interior provinces and in 1852 Justo José de Urquiza , another powerful caudillo , beat him out of power . As the new president of the Confederation, Urquiza enacted the liberal and federal 1853 Constitution. Buenos Aires seceded but was forced back into the Confederation after being defeated in the 1859 Battle of Cepeda . Overpowering Urquiza in the 1861 Battle of Pavón , Bartolomé Mitre secured Buenos Aires' predominance and

11557-606: The lake levels of the Eastern Paratethys dropped as it once again became a sea. The Fram Strait opened during the Miocene and acted as the only throughflow for Atlantic Water into the Arctic Ocean until the Quaternary period. Due to regional uplift of the continental shelf, this water could not move through the Barents Seaway in the Miocene. The modern day Mekong Delta took shape after 8 Ma. Geochemistry of

11684-610: The left-wing. By the end of 1976, the Montoneros had lost nearly 2,000 members and by 1977, the ERP was completely subdued. Nevertheless, the severely weakened Montoneros launched a counterattack in 1979, which was quickly put down, effectively ending the guerrilla threat and securing the junta's position in power. In March 1982, an Argentine force took control of the British territory of South Georgia and, on 2 April, Argentina invaded

11811-579: The mid-to-late 20th century, and now the country is referred to as "Argentina". The earliest traces of human life in the area now known as Argentina are dated from the Paleolithic period, with further traces in the Mesolithic and Neolithic . Until the period of European colonization, Argentina was relatively sparsely populated by a wide number of diverse cultures with different social organizations, which can be divided into three main groups. The first group are basic hunters and food gatherers without

11938-418: The middle-class, university students, and professors were seen as particularly troublesome. Perón fired over 2,000 university professors and faculty members from all major public education institutions. Perón tried to bring most trade and labour unions under his thumb, regularly resorting to violence when needed. For instance, the meat-packers union leader, Cipriano Reyes , organized strikes in protest against

12065-408: The military. Her short presidency was marked by the collapse of Argentine political and social systems, leading to a constitutional crisis that paved the way for a decade of instability, left-wing terrorist guerrilla attacks, and state-sponsored terrorism. The "Dirty War" (Spanish: Guerra Sucia ) was part of Operation Condor , which included the participation of other right-wing dictatorships in

12192-507: The national economic system only took place when the mere extraction of wood and tannin was replaced by the production of cotton . The Argentine government considered indigenous people as inferior beings, without the same rights as Criollos and Europeans. In 1912, President Roque Sáenz Peña enacted universal and secret male suffrage , which allowed Hipólito Yrigoyen , leader of the Radical Civic Union (or UCR), to win

12319-572: The north, Brazil to the northeast, Uruguay and the South Atlantic Ocean to the east, and the Drake Passage to the south. Argentina is a federal state subdivided into twenty-three provinces , and one autonomous city , which is the federal capital and largest city of the nation, Buenos Aires . The provinces and the capital have their own constitutions, but exist under a federal system . Argentina claims sovereignty over

12446-500: The north, and General José de San Martín . He joined Bernardo O'Higgins and they led a combined army across the Andes and secured the independence of Chile; then it was sent by O'Higgins orders to the Spanish stronghold of Lima and proclaimed the independence of Peru . In 1819 Buenos Aires enacted a centralist constitution that was soon abrogated by federalists. Some of the most important figures of Argentine independence made

12573-547: The north, increasing precipitation over southern China whilst simultaneously decreasing it over Indochina during the EASM. Western Australia was at this time characterised by exceptional aridity. In Antarctica, average summer temperatures on land reached 10 °C. In the oceans, the lysocline shoaled by approximately half of a kilometre during warm phases that corresponded to orbital eccentricity maxima. The MMCO ended around 14 million years ago, when global temperatures fell in

12700-523: The origin of many modern genera such as Nerodia , Lampropeltis , Pituophis and Pantherophis ). Arthropods were abundant, including in areas such as Tibet where they have traditionally been thought to be undiverse. Neoisopterans diversified and expanded into areas they previously were absent from, such as Madagascar and Australia. In the oceans, brown algae , called kelp , proliferated, supporting new species of sea life, including otters , fish and various invertebrates . Corals suffered

12827-448: The party from any future elections. Arturo Frondizi from the UCR won the 1958 general election . He encouraged investment to achieve energetic and industrial self-sufficiency, reversed a chronic trade deficit and lifted the ban on Peronism; yet his efforts to stay on good terms with both the Peronists and the military earned him the rejection of both and a new coup forced him out. Amidst

12954-417: The political ladder, being named Minister of Defence by 1944. Being perceived as a political threat by rivals in the military and the conservative camp, he was forced to resign in 1945, and was arrested days later. He was finally released under mounting pressure from both his base and several allied unions. He would later become president after a landslide victory over the UCR in the 1946 general election as

13081-414: The political turmoil, Senate leader José María Guido reacted swiftly and applied anti- power vacuum legislation, ascending to the presidency himself; elections were repealed and Peronism was prohibited once again. Arturo Illia was elected in 1963 and led an increase in prosperity across the board; however he was overthrown in 1966 by another military coup d'état led by General Juan Carlos Onganía in

13208-463: The possible herpetotheriid Morotodon from the late Early Miocene of Uganda. Approximately 100 species of apes lived during this time , ranging throughout Africa, Asia and Europe and varying widely in size, diet, and anatomy. Due to scanty fossil evidence it is unclear which ape or apes contributed to the modern hominid clade, but molecular evidence indicates this ape lived between 18 and 13 million years ago. The first hominins ( bipedal apes of

13335-846: The preceding Oligocene and following Pliocene Epochs: Continents continued to drift toward their present positions. Of the modern geologic features, only the land bridge between South America and North America was absent, although South America was approaching the western subduction zone in the Pacific Ocean , causing both the rise of the Andes and a southward extension of the Meso-American peninsula. Mountain building took place in western North America , Europe , and East Asia . Both continental and marine Miocene deposits are common worldwide with marine outcrops common near modern shorelines. Well studied continental exposures occur in

13462-622: The prosecution of those responsible for human rights violations during the Proceso : the Trial of the Juntas and other martial courts sentenced all the coup's leaders but, under military pressure, he also enacted the Full Stop and Due Obedience laws, which halted prosecutions further down the chain of command . The worsening economic crisis and hyperinflation reduced his popular support and

13589-557: The region with the 1502 voyage of Amerigo Vespucci . The Spanish navigators Juan Díaz de Solís and Sebastian Cabot visited the territory that is now Argentina in 1516 and 1526, respectively. In 1536 Pedro de Mendoza founded the small settlement of Buenos Aires , which was abandoned in 1541. Further colonization efforts came from Paraguay —establishing the Governorate of the Río de la Plata — Peru and Chile. Francisco de Aguirre founded Santiago del Estero in 1553. Londres

13716-620: The same time relations with the United States and the United Kingdom became increasingly strained. By 2015, the Argentine GDP grew by 2.7% and real incomes had risen over 50% since the post-Menem era. Despite these economic gains and increased renewable energy production and subsidies, the overall economy had been sluggish since 2011. On 22 November 2015, after a tie in the first round of presidential elections on 25 October , center-right coalition candidate Mauricio Macri won

13843-512: The self-proclaimed Argentine Revolution , creating a new military government that sought to rule indefinitely. Following several years of military rule, Alejandro Agustín Lanusse was appointed president by the military junta in 1971. Under increasing political pressure for the return of democracy, Lanusse called for elections in 1973. Perón was banned from running but the Peronist party was allowed to participate. The presidential elections were won by Perón's surrogate candidate, Hector Cámpora ,

13970-563: The silver and gold mines in Bolivia and Peru, and as such it became part of the Viceroyalty of Peru until the creation of the Viceroyalty of the Río de la Plata in 1776 with Buenos Aires as its capital. Buenos Aires repelled two ill-fated British invasions in 1806 and 1807. The ideas of the Age of Enlightenment and the example of the first Atlantic Revolutions generated criticism of

14097-714: The southernmost tip of Patagonia, meaning that the Chile Triple Junction lay near the Strait of Magellan . As the southern part of Nazca Plate and the Chile Rise became consumed by subduction the more northerly regions of the Antarctic Plate begun to subduct beneath Patagonia so that the Chile Triple Junction advanced to the north over time. The asthenospheric window associated to the triple junction disturbed previous patterns of mantle convection beneath Patagonia inducing an uplift of ca. 1 km that reversed

14224-434: The start of the steady economic and social decline that pushed the country back into underdevelopment. Uriburu ruled for two years; then Agustín Pedro Justo was elected in a fraudulent election , and signed a controversial treaty with the United Kingdom . Argentina stayed neutral during World War II , a decision that had full British support but was rejected by the United States after the attack on Pearl Harbor . In 1943

14351-503: The successor state of the Viceroyalty of the Río de la Plata , a Spanish overseas viceroyalty founded in 1776. The declaration and fight for independence (1810–1818) was followed by an extended civil war that lasted until 1861, culminating in the country's reorganization as a federation . The country thereafter enjoyed relative peace and stability, with several waves of European immigration , mainly Italians and Spaniards , influencing its culture and demography . Following

14478-450: The violence in Argentina alone included an estimated 15,000 to 30,000 left-wing activists and militants, including trade unionists, students, journalists, Marxists , Peronist guerrillas , and alleged sympathizers. Most of the victims were casualties of state terrorism . The opposing guerrillas' victims numbered nearly 500–540 military and police officials and up to 230 civilians. Argentina received technical support and military aid from

14605-612: The west coast of South America are thought to be caused by a regional phenomenon while the steadily rising central segment of the Andes represents an exception. While there are numerous registers of Oligocene–Miocene transgressions around the world it is doubtful that these correlate. It is thought that the Oligocene–Miocene transgression in Patagonia could have temporarily linked the Pacific and Atlantic Oceans, as inferred from

14732-510: The world's top five exporters. Its railway mileage rose from 503 to 31,104 km (313 to 19,327 mi). Fostered by a new public, compulsory, free and secular education system, literacy quickly increased from 22% to 65%, a level higher than most Latin American nations would reach even fifty years later. Furthermore, real GDP grew so fast that despite the huge immigration influx, per capita income between 1862 and 1920 went from 67% of developed country levels to 100%: In 1865, Argentina

14859-423: Was Allodesmus . A ferocious walrus , Pelagiarctos may have preyed upon other species of pinnipeds including Allodesmus . Furthermore, South American waters witnessed the arrival of Megapiranha paranensis , which were considerably larger than modern age piranhas . New Zealand 's Miocene fossil record is particularly rich. Marine deposits showcase a variety of cetaceans and penguins , illustrating

14986-624: Was a gradual and progressive trend of increasing aridification, though it was not unidirectional, and wet humid episodes continued to occur. Between 7 and 5.3 Ma, temperatures dropped sharply again in the Late Miocene Cooling (LMC), most likely as a result of a decline in atmospheric carbon dioxide and a drop in the amplitude of Earth's obliquity, and the Antarctic ice sheet was approaching its present-day size and thickness. Ocean temperatures plummeted to near-modern values during

15113-591: Was adopted as a symbol by the Filipinos in the Philippine Revolution against Spain. He also secured the diplomatic recognition of Argentina from King Kamehameha I of the Kingdom of Hawaii . Historian Pacho O'Donnell affirms that Hawaii was the first state that recognized Argentina's independence. He was finally arrested in 1819 by Chilean patriots. Revolutionaries split into two antagonist groups:

15240-578: Was already in common usage by the 18th century, the country was formally named " Viceroyalty of the Río de la Plata " by the Spanish Empire , and " United Provinces of the Río de la Plata " after independence. The 1826 constitution included the first use of the name "Argentine Republic" in legal documents. The name "Argentine Confederation" was also commonly used and was formalized in the Argentine Constitution of 1853 . In 1860

15367-473: Was already one of the top 25 nations by per capita income. By 1908, it had surpassed Denmark, Canada and the Netherlands to reach 7th place—behind Switzerland, New Zealand, Australia, the United States, the United Kingdom and Belgium. Argentina's per capita income was 70% higher than Italy's, 90% higher than Spain's, 180% higher than Japan's and 400% higher than Brazil 's. Despite these unique achievements,

15494-520: Was arid, particularly so during the Middle Miocene. Climates remained moderately warm, although the slow global cooling that eventually led to the Pleistocene glaciations continued. Although a long-term cooling trend was well underway, there is evidence of a warm period during the Miocene when the global climate rivalled that of the Oligocene . The climate of the Miocene has been suggested as

15621-404: Was elected as the first president of the reunified country. He was followed by Domingo Faustino Sarmiento and Nicolás Avellaneda ; these three presidencies set up the basis of the modern Argentine State. Starting with Julio Argentino Roca in 1880, ten consecutive federal governments emphasized liberal economic policies . The massive wave of European immigration they promoted—second only to

15748-413: Was founded in 1558; Mendoza , in 1561; San Juan , in 1562; San Miguel de Tucumán , in 1565. Juan de Garay founded Santa Fe in 1573 and the same year Jerónimo Luis de Cabrera set up Córdoba . Garay went further south to re-found Buenos Aires in 1580. San Luis was established in 1596. The Spanish Empire subordinated the economic potential of the Argentine territory to the immediate wealth of

15875-688: Was inversely correlated with carbon dioxide levels and global temperatures during the Miocene. Most modern lineages of diatoms appeared by the Late Miocene. There is evidence from oxygen isotopes at Deep Sea Drilling Program sites that ice began to build up in Antarctica about 36 Ma during the Eocene . Further marked decreases in temperature during the Middle Miocene at 15 Ma probably reflect increased ice growth in Antarctica. It can therefore be assumed that East Antarctica had some glaciers during

16002-646: Was most intense there. Around this time the Mi3b glacial event (a massive expansion of Antarctic glaciers) occurred. The East Antarctic Ice Sheet (EAIS) markedly stabilised following the MMCT. The intensification of glaciation caused a decoherence of sediment deposition from the 405 kyr eccentricity cycle. The MMWI ended about 11 Ma, when the Late Miocene Cool Interval (LMCI) started. A major but transient warming occurred around 10.8-10.7 Ma. During

16129-599: Was ousted one year later by a junta of the combined armed forces, led by army general Jorge Rafael Videla . They initiated the National Reorganization Process , often shortened to Proceso . The Proceso shut down Congress, removed the judges on the Supreme Court, banned political parties and unions, and resorted to employing the forced disappearance of suspected guerrilla members including individuals suspected of being associated with

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