North America, third largest of the seven continents, including Canada (the 2nd largest country in area in the world), the United States (3rd largest), and Mexico (14th largest). The continent also includes Greenland, the largest island, as well as the small French overseas department of Saint-Pierre and Miquelon and the British dependency of Bermuda (both made up of small islands in the Atlantic Ocean). With more than 405 million inhabitants estimate), North America is the 4th most populous continent; the United States ranks 3rd and Mexico 11th in population among the world's countries. Canada and the United States have technologically developed early modern economies, and Mexico, although less technologically developed than its neighbors, contains some of the world's greatest deposits of petroleum and natural gas.

Together with Central America, the West Indies, and South America, North America makes up the Western Hemisphere of Earth. North America is sometimes defined to include Central America and the West Indies, which are treated separately in Encarta Encyclopedia. The name America is derived from that of Italian navigator Amerigo Vespucci, who may have visited the mainland of North America in 1497 and 1498.

North America is roughly wedge shaped, with its broadest expanse in the north. Most of its bulk is in the middle latitudes, with a considerable northern section in the Arctic and a narrow part around the tropic of Cancer. The continent sprawls east-west across some 176° of longitude, from longitude 12° west at Nordost Rundingen (Northeast Foreland) in northeastern Greenland to longitude 172° east at the western extremity of Attu Island, Alaska. Its north-south extent is some 69°, from latitude 83° north at Cape Morris Jesup in eastern Greenland to latitude 14° north in southern Mexico. North America is bordered on the north by the Arctic Ocean; on the east by the Atlantic Ocean; on the south by the Gulf of Mexico, Central America, and the Pacific Ocean; and on the west by the Pacific Ocean. The area of the continent is 23.7 million sq km (9.2 million sq mi).

The outline of North America is exceedingly irregular; some extensive coastal reaches are relatively smooth, but by and large the coastline is broken and embayed, with many prominent offshore islands. The continent has three enormous coastal indentations: Hudson Bay in the northeast, the Gulf of Mexico in the southeast, and the Gulf of Alaska in the northwest. There are many small islands near the eastern and western coasts, but the most prominent islands are in the far north.

According to a widely accepted theory, almost all of North America is situated on the North American plate, an enormous platform considered one of about a dozen major units constituting the structural mosaic of the earth's crust. It is thought that North America was once joined to modern-day Europe and Africa and that it began to break away about 170 million years ago, in the Jurassic Period, with the process of continental drift accelerating about 95 million years ago, in the Cretaceous Period. As North America drifted west at a rate of 1.25 cm (0.5 in) per year, the plate underlying the Pacific Ocean is believed to have thrust under the North American plate, thereby causing widespread early folding, evident today in a series of high mountains along the western coast. As the Atlantic Ocean widened, it caused extensive faulting along the eastern coast, resulting in the creation of mountains and offshore islands.

North America can be divided into five major natural regions. The eastern half of Canada, as well as most of Greenland and sections of Minnesota, Wisconsin, Michigan, and New York in the United States, are part of the Canadian Shield (or Laurentian Plateau), which is a plateau region underlain by ancient crystalline rocks. The region has poor soil, and dense forests cover much of its southern part. A second region is made up of a coastal plain in most of the eastern United States and Mexico. In the United States the coastal plain is bordered on the west by a third region, comprising a relatively narrow cordillera of mountains and hills, notably the rounded Appalachian Mountains. A fourth region consists of the central portion of the continent, from southern Canada to southwestern Texas, which encompasses an extensive lowland that has experienced alternating periods of submergence beneath the sea and uplift, with the result that it is deeply covered with layers of sedimentary rock. It is not an uninterrupted flatland but includes much undulating and even hilly terrain, such as the Ozark Plateau. The western portion is made up of the Great Plains, which slope upward to the foot of the Rocky Mountains.

The fifth, and westernmost, region of North America, taking in most of Mexico, is an active zone of mountain building; its recent geological history is dominated by crustal movements and volcanic activity. Adjacent to the Great Plains in the United States and Canada are the Rocky Mountains, which are geologically related to the Sierra Madre Oriental range of Mexico. To the west is an area of scattered basins and high plateaus, including the Interior Plateau of British Columbia in Canada, the Colorado Plateau and the Great Basin of the United States, and the vast central plateau of Mexico. Along the Pacific coast are a number of lofty mountain systems, extending from the Alaska Range to the Sierra Madre Occidental and Sierra Madre del Sur of Mexico. In between are ranges such as the Coast Mountains of British Columbia and the Cascade Range, the Coast Ranges, and the Sierra Nevada of the United States. Interspersed are some low-lying areas, notably the fertile Central Valley of California. The highest point in North America, Mount McKinley, or Denali (6,194 m/20,320 ft), is situated in the Alaska Range, and the lowest point, 86 m (282 ft) below sea level, is in Death Valley, California, a part of the Great Basin.

The Continental, or Great, Divide, which mainly runs along the crest of the Rocky Mountains, splits North America into two great drainage basins. To the east of the divide, water flows toward the Arctic Ocean, Hudson Bay, the Atlantic Ocean, and the Gulf of Mexico, and to the west, rivers flow toward the Pacific Ocean.

Two prominent drainage systems—the Great Lakes-St. Lawrence River system and the Mississippi-Missouri river system—dominate the hydrography of eastern and central North America. The five Great Lakes (Superior, Michigan, Huron, Erie, and Ontario) drain northeast to the Atlantic Ocean via the relatively short St. Lawrence River. Most of the central part of the United States and a small part of southern Canada are drained south to the Gulf of Mexico by the Mississippi River and its tributaries, notably the Missouri River, the longest river in North America. A great many short, but often voluminous, rivers flow to the Atlantic and Gulf of Mexico along the well-watered eastern coasts of Canada, the United States, and Mexico. The northern interior of the continent is drained by the great Mackenzie River system of western Canada and by the numerous rivers that flow into Hudson Bay. To the west of the Continental Divide are relatively few major rivers (notably the Colorado, Columbia, Fraser, and Yukon) and many short, large-volume streams.

The southern half of North America contains only a few large natural lakes, but Canada and the northern United States have a vast number of sizable lakes. Lake Superior, the world's biggest freshwater lake, and 10 of the next 25 largest natural lakes are found in this region. Lake Mead, on the Colorado River in the United States, is a large artificial lake, and Great Salt Lake, in Utah, is noted for its highly saline water.

Although North America has considerable climatic variety, five principal climatic regions can be identified. The northern two-thirds of Canada and Alaska, as well as all of Greenland, have subarctic and arctic climates, in which long, dark, bitterly cold winters alternate with brief, mild summers. Most of the region, which receives relatively little precipitation, is covered with snow and ice during much of the year. A second climatic region is made up of the eastern two-thirds of the United States and southern Canada. It is characterized by a humid climate in which all four seasons are evident, and weather changes are frequent. The southern part of this region has a warmer average temperature. A third region includes the western interior of the United States and much of northern Mexico. It is mostly mountain and desert country, generally receiving small amounts of precipitation, but with significant local variations due to altitude and exposure. A fourth climatic region is made up of a narrow zone along the Pacific Ocean from southern Alaska to southern California. It has relatively mild but wet winters and almost rainless summers. Most of southern Mexico has a tropical climate, with year-round warmth and considerable precipitation, especially in summer.

The natural vegetation of North America has been significantly modified by human activity, but its general nature is still apparent over much of the continent. The most notable forest is the taiga, or boreal forest, an enormous expanse of mostly coniferous trees (especially spruce, fir, hemlock, and larch) that covers most of southern and central Canada and extends into Alaska. In the eastern United States a mixed forest, dominated by deciduous trees in the north and by various species of yellow pine in the southeast, has mostly been cleared or cut over, but a considerable area has regrown since the 1940s. In the western portion of the continent, forests are primarily associated with mountain ranges, and coniferous trees are dominant. In California, the redwood and giant sequoia grow to enormous size. A great mixture of species characterizes the tropical forests of Mexico.

The vegetation cover in the drier parts of the continent is made up mainly of grassland and shrubland. The central plains and prairies of the United States and southern Canada were originally grass covered, but much of the natural flora has been replaced by commercial crops. The dry lands of the western United States and northern Mexico are sparsely covered with a variety of shrubs and many kinds of cactus. Beyond the tree line in the far north is a region of tundra, containing a mixture of low-growing sedges, grasses, mosses, and lichens.

The native wildlife of North America was once numerous and diverse, but the spread of human settlement has resulted in contracting habitats and diminishing numbers. In general, the fauna of North America is similar to that of the northern areas of Europe and Asia. Notable large mammals include several kinds of bear, the largest being the grizzly; bighorn sheep; bison, now only in protected herds; caribou; moose, called elk in Europe; musk-ox; and wapiti. Large carnivores include the puma and, in southernmost regions, the jaguar; the wolf and its smaller relative, the coyote; and, in the far north, the polar bear. One species of marsupial, the common opossum, is indigenous to the continent. A few of the many reptiles are poisonous, including the coral snake, pit vipers such as the rattlesnake and copperhead, and the Gila monster and beaded lizard of the southwestern United States and Mexico, the only poisonous lizards in the world. A great variety of finfish and shellfish live in the marine waters off North America, and many kinds of fish are found in its freshwater rivers and lakes.

North America has large deposits of many important minerals. Petroleum and natural gas are found in great quantity in northern Alaska, western Canada, the southern and western conterminous United States, and eastern Mexico; huge beds of coal are in eastern and western Canada and the United States; and great iron-ore deposits are in eastern Canada, the northern United States, and central Mexico. Canada also has major deposits of copper, nickel, uranium, zinc, asbestos, and potash; the United States contains great amounts of copper, molybdenum, nickel, phosphate rock, and uranium; and Mexico has large reserves of barite, copper, fluorite, lead, zinc, manganese, and sulfur. All three countries have significant deposits of gold and silver.

North America was sparsely populated until relatively recent times. With the conspicuous exception of the inhabitants of the Mexican heartland (the plateaus and valleys around present-day Mexico City), the indigenous peoples of the continent were geographically scattered and culturally diverse. The settlement of the continent by Europeans began an almost total change in its human geography; Europeans decimated and displaced the indigenous peoples, and the living patterns of most were greatly altered. The contemporary population of North America is mostly European in background, but the continent's population also contains many other important groups.

At least 35 percent of Canada's inhabitants trace their ancestry to the British Isles, and another 25 percent are of French background; the latter live mostly in Québec Province. The country also has significant numbers of people of German, Italian, Polish, Ukrainian, Chinese, Dutch, and Scandinavian descent. The population of the United States is more diverse than Canada's. In 1990, people of at least part British or part Irish background formed the largest group, with approximately 29 percent of the country's inhabitants. Blacks, who trace their ancestry to Africa, make up 12 percent of the population, Germans 23 percent, and people of Hispanic background 9 percent. The country also has large numbers of people of Italian, Polish, French, Russian, Dutch, and Scandinavian ancestry. Persons of Asian origin—primarily Japanese, Chinese, Filipinos, Asian Indians, Koreans, and Vietnamese—make up only 2.9 percent of the population of the United States, but since the 1970s the number of Asians increased significantly through immigration.

Indigenous peoples, including Inuit and Eskimo, number 1.9 million in the United States and 800,000 in Canada. It is believed that the ancestors of the Native Americans migrated from northeastern Asia to North America via a prehistoric land bridge across the modern Bering Strait, off Alaska, that existed from about 25,000 to nearly 10,000 years ago. The forebears of the Inuit migrated from Asia by boat some 6,000 years ago. Some 30,000 Inuit live in Greenland.

Some 60 percent of the people of Mexico are mestizos, persons of mixed Native American and European (mainly Spanish) descent. Approximately 30 percent of the population is of relatively pure Native American ancestry, and some 10 percent is of unmixed European descent.

In 2003 the United States had 290,342,550 inhabitants; Mexico 104,907,990; Canada 32,207,113; and Greenland 56,385. Most of the population was concentrated in the eastern half of the United States and adjacent parts of Ontario and Québec, the U.S. Pacific coast, and the central plateau of Mexico. In the late 1990s more than 76 percent of the inhabitants of Canada, the United States, and Greenland were defined as urban, as were 74 percent of all Mexicans. The principal urban areas were on the U.S. Atlantic coast from Boston to Washington, D.C., around the shores of Lakes Erie and Ontario, at the southern end of Lake Michigan, in northern and southern California, and greater Mexico City. The largest cities included Mexico City, Guadalajara, and Monterrey, in Mexico; New York City, Los Angeles, Chicago, Houston, Philadelphia, and San Diego, in the United States; and Toronto, Montréal, Vancouver, Ottawa, and Edmonton, in Canada. Away from the metropolitan areas, most of North America had only a sparse to moderate population density. In Mexico the overall population density was 53.4 persons per sq km (138.3 per sq mi); in the United States, 30.2 per sq km (78.1 per sq mi); and in Canada, 3.2 per sq km (8.4 per sq mi). The great majority of Canadians lived in a relatively narrow band along the southern boundary.

In both Canada and the United States the rate of population increase has declined since the 1950s. The Canadian population increased by about 1 percent per year from 1980 to 1990, when the annual growth rate for the United States was also 1 percent and for Greenland, 1.2 percent. Mexico, however, had one of the hemisphere's highest rates of population increase, 2.2 percent per year, and its birth rate (21.9 per 1,000 people in 2003) was about double that of the rest of the continent. The death rate was 5 per 1,000 people in Mexico, 8 in Canada, and 8 in the United States

Intercontinental migration to North America was significant in the 1980s and 1990s, with large numbers of Asians and Europeans going to the United States and Canada. In addition, many people moved from South American and Caribbean countries to the United States. The largest population movements, however, occurred within North America itself, from Mexico to the United States and from the northeastern United States to southern and western parts of the country.

English is the principal language for some 90 percent of the people of the United States and for about two-thirds of all Canadians. Spanish is spoken by the majority of Hispanic people in the United States, and French is the chief tongue for about one-quarter of the Canadian population. Many of the indigenous peoples and Inuit of the United States, Canada, and Greenland use their traditional languages. Spanish is the dominant language of Mexico, but several million Mexicans speak a Native American language.

Christianity is the major religion of North America. The great majority of Mexicans are Roman Catholics, and some 45 percent of Canadians and 26 percent of U.S. inhabitants profess Roman Catholicism. Some 28 percent of Canada's people are Protestants and 8 percent are Anglicans. In the United States, Protestants make up 58 percent of the population. Canada and the United States also have substantial communities of Jews and Eastern Orthodox Christians.

Cultural life in the United States and Canada is highly developed and diversified, with the mass media (radio, television, motion pictures, and newspapers) playing an important role. Almost all North American cities support theatrical organizations and art museums, and musical groups are widespread. Traditional cultural patterns are more evident in the rural areas of Mexico, but its cities have a variety of modern cultural institutions.

The economic activities of North America are extraordinarily diverse. The United States and Canada have sophisticated modern economies. Modernization has been uneven in Mexico, with major developments in power, transportation, and manufacturing undercut by chronic inflation and a staggering burden of debt.

Farming is relatively more important in Mexico than it is in the other North American countries and provides employment for 28 percent of the labor force (compared with some 3 percent in the United States and 4 percent in Canada). Subsistence farming is still important throughout Mexico, especially in the south; commercial agriculture is well developed in many areas, however, particularly in the central plateau and in the north. The leading commodities are corn, wheat, and beans, which are raised mostly for domestic consumption, and cotton, cattle, coffee, and sugar, which are produced largely for export.

Agriculture in the United States and Canada is dominated by highly mechanized farms, which produce immense quantities of crops, livestock, and livestock products. The Great Plains of the central United States and the Canadian Prairie Provinces (Alberta, Manitoba, Saskatchewan) are major world producers of grain (particularly wheat, but also barley, oats, rye, and grain sorghum), oilseeds, and livestock (dairy and beef cattle and sheep). Perhaps the world's finest large farming area is the Corn Belt, that part of the U.S. Middle West from western Ohio to eastern Nebraska, which is the world's largest producer of corn, as well as a major supplier of other grains, soybeans, cattle, and hogs. Farming in California yields a huge amount of high-value irrigated crops, notably fruits and vegetables. Florida and Texas also are great producers of fruits and vegetables, and potatoes are grown in vast quantities in Idaho, Washington State, Oregon, Maine, North Dakota, and southeastern Canada. Other outstanding agricultural products include cotton, broiler chickens, dairy products, and sugarcane.

Forestry is an important sector of the Canadian economy, especially in British Columbia, Ontario, and Québec Province. Notable forest-products industries also flourish in the western United States (particularly in Washington, Oregon, and California) and in the southeastern United States.

Fishing is the leading economic activity in Greenland but is a relatively unimportant sector in Canada, the United States, and Mexico, even though the catch is large and some coastal areas are dependent on revenues from sales of finfish and shellfish. Besides the waters near Greenland, major fishing grounds are off the northern Pacific coast, off the northern Atlantic coast, and off the southern Atlantic and Gulf of Mexico coasts. In addition, large tuna fleets are based in southern California and western Mexico.

The extraction of minerals is an increasingly important economic activity in the United States, Canada, and Mexico. The United States has been one of the world's leading petroleum producers for many years, Canada has been a major producer since the late 1940s, and Mexico became a world leader in oil production in the late 1970s. The United States ranks second among world natural-gas producers and is also a leader in mining coal, produced particularly in the vast Appalachian fields. Iron ore has long been a major product of both the United States and Canada, primarily from deposits around the western end of Lake Superior. More recently, much iron ore has been produced in the Québec Province-Labrador border area of eastern Canada. Among the other minerals that have been recovered in quantity in North America are copper, silver, lead, zinc, nickel, sulfur, asbestos, uranium, phosphate rock, and potash.

Manufacturing has long been a leading economic sector of the United States. The principal concentrations of factories have been located in the urban areas of a manufacturing belt extending roughly from Boston to Chicago. Since the 1950s, however, manufacturing has expanded considerably in other parts of the country, particularly in the big cities of California and in the southeastern states. Output is extremely diversified, with emphasis on primary and fabricated metals, processed food, machinery, electronic and aerospace equipment, motor vehicles, chemicals, textiles, clothing, paper, and printed materials. Manufacturing also is a principal economic activity in Canada. Factories are situated primarily in the cities of Ontario, Québec Province, British Columbia, and Alberta; Toronto and Montréal are the leading manufacturing centers. Canadian firms produce a wide variety of goods, especially processed food and beverages, transportation equipment, paper and other forest products, primary and fabricated metals, chemicals, and electrical and electronic equipment.

Manufacturing has become an increasingly important part of the Mexican economy since the 1940s. Although not as technologically developed as in the United States and Canada, factories in Mexico produce a broad spectrum of goods, notably chemicals, clothing, processed food, motor vehicles and motor-vehicle parts, construction materials, and electrical and electronic equipment. Mexico City is by far the leading manufacturing center, but several other cities, including Monterrey and Guadalajara, have important concentrations of factories.

North America consumes great quantities of energy. Canada depends much more on hydroelectricity than do the United States and Mexico, but it also makes heavy use of petroleum and natural gas. The enormous consumption of energy in the United States requires great imports of petroleum and natural gas to bolster the considerable domestic output of coal, petroleum, natural gas, and hydroelectric and nuclear power. Mexico's energy production expanded considerably in the 1970s and early 1980s, primed by the increased domestic recovery of petroleum and natural gas.

The transportation network of North America is extremely well developed in most parts of the conterminous United States and in southernmost Canada. A remarkable system of limited-access interstate highways was built in the United States beginning in the 1950s, and the country in addition has a wide-ranging network of other all-weather roads. The rail network also is well established; it is cri