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Main article: Geography of the United States
As the world's third largest country (by total area), the United States landscape varies greatly: temperate forestland on the East coast, mangrove in Florida, the Great Plains in the center of the country, the Mississippi- Missouri river system, the Great Lakes which are shared with Canada, Rocky Mountains west of the plains, deserts and temperate coastal zones west of the Rocky Mountains and temperate rainforests in the Pacific Northwest. The arctic regions of Alaska and the volcanic islands of Hawaii only increase the geographic and climatic diversity.
The climate varies along with the landscape, from tropical in Hawaii to sub-tropical in Florida to tundra in Alaska. Large parts of the country have a continental climate, with warm summers and cold winters. Some parts of the United States, particularly parts of California, have a Mediterranean climate.
The political geography is notable as well, with the Canadian border being the longest undefended border in the world, and with the country being divided into three distinct sections: The continental United States, also known as the lower 48; Alaska, which is physically connected only to Canada, and the archipelago of Hawaii in the central Pacific Ocean.
The United States dollar, the nation's currency. Main article: Economy of the United States
The economy of the United States is organized primarily on a capitalist model, but with some government regulation in many industries. There are also some social welfare programs like Social Security, unemployment benefits, Temporary Assistance to Needy Families (" welfare"), Medicare, and Medicaid. Such departures from a pure free-market economy have generally increased since the late 1800s, but are still far less pronounced in the United States than in other ("first world") industrialized countries.
Several countries have coupled their currency with the dollar, or even use it as a currency, although this practice has subsided in recent years.
The country has rich mineral resources, with extensive gold, oil, coal and uranium deposits. Successful farm industries rank the country among the top producers of, among others, corn, wheat, sugar and tobacco. The U.S. manufacturing sector produces, among other things, cars, airplanes and electronics. The biggest industry is now service; about three-quarters of U.S. residents are employed in that sector.
The largest trading partner of the United States is its northern neighbor, Canada. Other major partners are Mexico, the European Union and the industrialized nations in Asia, such as Japan, India and South Korea. Trade with China is also significant.
In 2002, the United States was ranked as the third most-visited tourist destination in the world. Its 41.9 million visits trailed only France (77 million) and Spain (51.7 million).
See also: List of United States companies