North America is a continent in the Northern Hemisphere and almost entirely within the Western Hemisphere. It is bordered to the north by the Arctic Ocean, to the east by the Atlantic Ocean, to the southeast by South America and the Caribbean Sea, and to the west and south by the Pacific Ocean. Because it is on the North American Tectonic Plate, Greenland is included as a part of North America geographically.
North America covers an area of about 24,709,000 square kilometres (9,540,000 square miles), about 16.5% of Earth's land area and about 4.8% of its total surface. North America is the third-largest continent by area, following Asia and Africa, and the fourth by population after Asia, Africa, and Europe. In 2013, its population was estimated at nearly 579 million people in 23 independent states, or about 7.5% of the world's population. In human geography and in the English-speaking world outside the United States, particularly in Canada, "North America" and "North American" can refer to just Canada and the United States together.
North America was reached by its first human populations during the Last Glacial Period, via crossing the Bering land bridge approximately 20,000 to 17,000 years ago. The so-called Paleo-Indian period is taken to have lasted until about 10,000 years ago (the beginning of the Archaic or Meso-Indian period). The classic stage spans roughly the 6th to 13th centuries. The first recorded Europeans to visit North America (other than Greenland) were the Norse around 1000 AD. Christopher Columbus's arrival in 1492 sparked a transatlantic exchange which included migrations of European settlers during the Age of Discovery and the early modern period. Present-day cultural and ethnic patterns reflect interactions between European colonists, indigenous peoples, African slaves, immigrants from Europe, Asia, and the descendants of these groups.
Owing to Europe's colonization of the Americas, most North Americans speak European languages such as English, Spanish or French, and their cultures commonly reflect Western traditions. However, in parts of Canada, the United States, Mexico, and Central America, there are indigenous populations continuing their cultural traditions and speaking native languages. (Full article...)