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The Americas, or America, also known as the New World, are the combined continental landmass of the North America and South America continents in the Western Hemisphere.[5] Along with their associated islands, they cover 8.3% of the Earth's total surface area (28.4% of its land area). The topography is dominated by the American Cordillera, a long chain of mountains that run the length of the west coast. The flatter eastern side of the Americas is dominated by large river basins, such as the Amazon, Mississippi, and La Plata. Extending 14,000 km (8,699 mi) in a north-south orientation, the climate and ecology varies strongly across the Americas, from arctic tundra of Northern Canada, Greenland, and Alaska, to the tropical rain forests in Central America and South America.

Humans first settled the Americas from Asia between 40,000 BCE and 15,000 BCE. A second migration of Na-Dene speakers followed later from Asia. The subsequent migration of the Inuit into the neoarctic around 3500 BCE completed what is generally regarded as the settlement by the Indigenous peoples of the Americas. The first European discovery of and settlement in the Americas was by the Norse explorer Leif Ericson. However the colonization never became permanent and was later abandoned. The voyages of Christopher Columbus from 1492 to 1502 resulted in permanent contact with European (and subsequently, other Old World) powers, which led to the Columbian exchange. Diseases introduced from Europe and Africa devastated the Indigenous peoples, and the European powers colonised the Americas.[7] Mass emigration from Europe, including large numbers of indentured servants, and forced immigration of African slaves largely replaced the Indigenous Peoples. Beginning with the American Revolution in 1776 and Haitian Revolution in 1791, the European powers began to decolonise the Americas. Currently, almost all of the population of the Americas resides in independent countries; however, the legacy of the colonisation and settlement by Europeans is that the Americas share many common cultural traits, most notably the predominant adherence to Christianity and use of Indo-European languages; primarily Spanish, English, and Portuguese. More than 900 million people live in the Americas (about 13.5% of the human population), the most populous countries being the United States, Brazil, and Mexico, the most populous cities being New York City, São Paulo, and Mexico City.

                                                                                                            


Etymology and naming :
The earliest known use of the name America dates to April 25, 1507, where it was applied to what is now known as South America.[8] It appears on a small globe map with twelve time zones, together with the largest wall map made to date, both created by the German cartographer Martin Waldseemüller in Saint-Dié-des-Vosges in France. These were the first maps to show the Americas as a land mass separate from Asia. An accompanying book, Cosmographiae Introductio, anonymous but apparently written by Waldseemüller's collaborator Matthias Ringmann,[9] states, "I do not see what right any one would have to object to calling this part [that is, the South American mainland], after Americus who discovered it and who is a man of intelligence, Amerigen, that is, the Land of Americus, or America: since both Europa and Asia got their names from women". Americus Vespucius is the Latinized version of the Florentine explorer Amerigo Vespucci's name, and America is the feminine form of Americus. Amerigen is explained as Amerigo plus gen, the accusative case of the Greek word for 'earth', and meaning 'land of Amerigo'.[9] (See etymology.) Amerigo itself is an Italian form of the medieval Latin Emericus (see also Saint Emeric of Hungary), which through the German form Heinrich (in English, Henry) derived from the Germanic name Haimirich

Geography :
Further information: Geography of North America and Geography of South America


Extent :
the northernmost point of the Americas is Kaffeklubben Island, which is the most northerly point of land on Earth.[12] The southernmost point is the islands of Southern Thule, although they are sometimes considered part of Antarctica.[13] The mainland of the Americas is the world's longest north-to-south landmass. The distance between its two polar extremities, the Boothia Peninsula in northern Canada and Cape Froward in Chilean Patagonia, is roughly 14,000 km (8,700 mi).[14] The mainland's most westerly point is the end of the Seward Peninsula in Alaska; Attu Island, further off the Alaskan coast to the west, is considered the westernmost point of the Americas. Ponta do Seixas in northeastern Brazil forms the easternmost extremity of the mainland,[14] while Nordostrundingen, in Greenland, is the most easterly point of the continental shelf.


Topography :
The geography of the western Americas is dominated by the American cordillera, with the Andes running along the west coast of South America[18] and the Rocky Mountains and other North American Cordillera ranges running along the western side of North America.[19] The 2,300-kilometer-long (1,400 mi) Appalachian Mountains run along the east coast of North America from Alabama to Newfoundland.[20] North of the Appalachians, the Arctic Cordillera runs along the eastern coast of Canada.

Geology :
South America broke off from the west of the supercontinent Gondwana around 135 million years ago, forming its own continent.[15] Around 15 million years ago, the collision of the Caribbean Plate and the Pacific Plate resulted in the emergence of a series of volcanoes along the border that created a number of islands. The gaps in the archipelago of Central America filled in with material eroded off North America and South America, plus new land created by continued volcanism. By three million years ago, the continents of North America and South America were linked by the Isthmus of Panama, thereby forming the single landmass of the Americas.[16] The Great American Interchange resulted in many species being spread across the Americas, such as the cougar, porcupine, opossums, armadillos and hummingbirds


Hydrology :
With coastal mountains and interior plains, the Americas have several large river basins that drain the continents. The largest river basin in North America is that of the Mississippi, covering the second largest watershed on the planet.[26] The Mississippi-Missouri river system drains most of 31 states of the U.S., most of the Great Plains, and large areas between the Rocky and Appalachian mountains. This river is the fourth longest in the world and tenth most powerful in the world.

In North America, to the east of the Appalachian Mountains, there are no major rivers but rather a series of rivers and streams that flow east with their terminus in the Atlantic Ocean, such as the Hudson River, Saint John River, and Savannah River. A similar instance arises with central Canadian rivers that drain into Hudson Bay; the largest being the Churchill River. On the west coast of North America, the main rivers are the Colorado River, Columbia River, Yukon River, Fraser River, and Sacramento River.


Climate :
The climate of the Americas varies significantly from region to region. Tropical rainforest climate occurs in the latitudes of the Amazon, American Cloud forests, Florida and Darien Gap. In the Rocky Mountains and Andes, a similar climate is observed. Often the higher altitudes of these mountains are snow capped.

Southeastern North America is well known for its occurrence of tornadoes and hurricanes, of which the vast majority of tornadoes occur in the United States' Tornado Alley.[32] Often parts of the Caribbean are exposed to the violent effects of hurricanes. These weather systems are formed by the collision of dry, cool air from Canada and wet, warm air from the Atlantic.


Population :
Further information: List of sovereign states and dependent territories in the Americas by population

The total population of the Americas is about 859,000,000 people and is divided as follows

North America :
2001 with 495 million and in 2002 with 501 million (includes Central America and the Caribbean)
    South America: 2001 with 352 million and in 2002 with 357 million

Largest urban centers :
See also: Largest cities in the Americas and List of metropolitan areas in the Americas by population

There are three urban centers that each hold titles for being the largest population area based on the three main demographic concepts:[33]

City proper :
A city proper is the locality with legally fixed boundaries and an administratively recognized urban status that is usually characterized by some form of local government.[34][35][36][37][38]

Urban area :
An urban area is characterized by higher population density and vast human features in comparison to areas surrounding it. Urban areas may be cities, towns or conurbations, but the term is not commonly extended to rural settlements such as villages and hamlets. Urban areas are created and further developed by the process of urbanization and do not include large swaths or rural land, as do metropolitan areas.

Metropolitan area :
Unlike an urban area, a metropolitan area includes not only the urban area, but also satellite cities plus intervening rural land that is socio-economically connected to the urban core city, typically by employment ties through commuting, with the urban core city being the primary labor market.

In accordance with these definitions, the three largest population centers in the Americas are: Mexico City, anchor to the largest metropolitan area in the Americas; New York City, anchor to the largest urban area in the Americas; and São Paulo, the largest city proper in the Americas. All three cities maintain Alpha classification and large scale influence.



Religion :
Further information: Religion in Latin America, Religion in North America, Christianity in the Americas, and Islam in the Americas

The most prevalent faiths in the Americas are as follows :
Christianity (North America: 85 percent; South America: 93 percent)
Roman Catholicism (practiced by 88 percent of the Mexican population;[41] approximately 74 percent of the population of Brazil, whose Roman Catholic population of 182 million is the greatest of any nation's;[42] approximately 24 percent of the United States' population;[43] and more than 40 percent of all of Canadians)
Protestantism (practiced mostly in the United States, where half of the population are Protestant, and Canada, with slightly more than a quarter of the population; there is a growing contingent of Evangelical and Pentecostal movements in predominantly Catholic Latin America)[45]
Eastern Orthodoxy (found mostly in the United States and Canada—1 percent of the U.S. citizenry; this Christian group is growing faster than many other Christian groups in Canada and now represents roughly 3 percent of the Canadian population)[citation needed]
Non-denominational Christians and other Christians (some 1,000 different Christian denominations and sects practiced in the Americas)
Irreligion (includes atheists and agnostics, as well as those who profess some form of spirituality but do not identify themselves as members of any organized religion)
Islam (practiced by 2 percent of Canadians [580,000 persons][46] and 0.6 percent of the U.S. population [1,820,000 persons[43]]). Together, Muslims constitute about 1 percent of the North American population and 0.3 percent of all Latin Americans. Argentina has the largest Muslim population in Latin America with up to 600,000 persons, or 1.9 percent of the population.[47]
Judaism (practiced by 2 percent of North Americans—approximately 2.5 percent of the U.S. population and 1.2 percent of Canadians[48]—and 0.23 percent of Latin Americans—Argentina has the largest Jewish population in Latin America with 200,000 members)[49]

Other faiths include Buddhism; Hinduism; Sikhism; Bahá'í Faith; a wide variety of indigenous religions, many of which can be categorized as animistic; new age religions and many African and African-derived religions. Syncretic faiths can also be found throughout the continent.

Languages :-
Main articles: Indigenous languages of the Americas, Languages of North America, and Languages of South America
Languages spoken in the Americas

Various languages are spoken in the Americas. Some are of European origin, others are spoken by indigenous peoples or are the mixture of various idioms like the different creoles.

The dominant language of Latin America is Spanish, though the largest nation in Latin America, Brazil, speaks Portuguese. Small enclaves of French-, Dutch- and English-speaking regions also exist in Latin America, notably in French Guiana, Suriname, and Belize and Guyana respectively, and Haitian Creole, of French origin, is dominant in the nation of Haiti. Native languages are more prominent in Latin America than in Anglo-America, with Nahuatl, Quechua, Aymara and Guaraní as the most common. Various other native languages are spoken with less frequency across both Anglo-America and Latin America. Creole languages other than Haitian Creole are also spoken in parts of Latin America.