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Lewis, While it might seem surprising to find North and South America still joined into a single continent in a book published in the United States in 1937, such a notion remained fairly common until World War II.It cannot be coincidental that this idea served American geopolitical designs at the time, which sought both Western Hemispheric domination and disengagement from the "Old World" continents of Europe, Asia, and Africa.Together, they make up most of the land in Earth's western hemisphere and comprise the New World.Along with their associated islands, they cover 8% of Earth's total surface area and 28.4% of its land area.However, without a clarifying context, singular America in English commonly refers to the United States of America.Historically, in the English-speaking world, the term America used to refer to a single continent until the 1950s (as in Van Loon's Geography of 1937): According to historians Kären Wigen and Martin W.
The Spanish 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 and inaugurated a period of exploration, conquest, and colonization whose effects and consequences persist to the present.
Humans first settled the Americas from Asia between 42,000 and 17,000 years ago.
A second migration of Na-Dene speakers followed later from Asia.
Lawrence River / Great Lakes basin, Mississippi, and La Plata.
Since the Americas extend 14,000 km (8,700 mi) from north to south, the climate and ecology vary widely, from the arctic tundra of Northern Canada, Greenland, and Alaska, to the tropical rain forests in Central America and South America.