Infrastructure




Transportation

Personal transportation is dominated by automobiles, which operate on a network of 4 million miles (6.4 million kilometers) of public roads. The United States has the world's second-largest automobile market, and has the highest vehicle ownership per capita in the world, with 816.4 vehicles per 1,000 Americans (2014). In 2017, there were 255,009,283 non-two wheel motor vehicles, or about 910 vehicles per 1,000 people.

The civil airline industry is entirely privately owned and has been largely deregulated since 1978, while most major airports are publicly owned. The three largest airlines in the world by passengers carried are U.S.-based; American Airlines is number one after its 2013 acquisition by US Airways. Of the world's 50 busiest passenger airports, 16 are in the United States, including the busiest, Hartsfield–Jackson Atlanta International Airport.

Energy

The United States energy market is about 29,000 terawatt hours per year. In 2005, 40% of this energy came from petroleum, 23% from coal, and 22% from natural gas. The remainder was supplied by nuclear and renewable energy sources.

Since 2007, the total greenhouse gas emissions by the United States are the second highest by country, exceeded only by China. The United States has historically been the world's largest producer of greenhouse gases, and greenhouse gas emissions per capita remain high.

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United States

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Coordinates: 40°N 100°W  /  40°N 100°W  / 40; -100 The United States of America ( USA ), commonly known as the United States ( U.S. or US ) or America , is a country located primarily in North America, consisting of 50 states, a federal district, five major self-governing territories, and various possessions.h At 3.8 million square miles (9.8 million square kilometers), it is the world's third- or fourth-largest country by total area.d With a population of over 328 million , it is the third most populous country in the world. The national capital is Washington, D.C., and the most populous city is New York City. Paleo-Indians migrated from Siberia to the North American mainland at least 12,000 years ago, and European colonization began in the 16th century. The United States emerged from the thirteen British colonies established along the East Coast. Disputes over taxation and political representation with Great Britain led to the American Revolutionary War (1775–1783), whi...
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Demographics

None Population Historical population Census Pop. %± 1790 3,929,214 — 1800 5,308,483 35.1% 1810 7,239,881 36.4% 1820 9,638,453 33.1% 1830 12,866,020 33.5% 1840 17,069,453 32.7% 1850 23,191,876 35.9% 1860 31,443,321 35.6% 1870 38,558,371 22.6% 1880 50,189,209 30.2% 1890 62,979,766 25.5% 1900 76,212,168 21.0% 1910 92,228,496 21.0% 1920 106,021,537 15.0% 1930 123,202,624 16.2% 1940 132,164,569 7.3% 1950 151,325,798 14.5% 1960 179,323,175 18.5% 1970 203,211,926 13.3% 1980 226,545,805 11.5% 1990 248,709,873 9.8% 2000 281,421,906 13.2% 2010 308,745,538 9.7% 2019 (est.) 328,239,523 6.3% Note that the census numbers do not include Native Americans until 1860. The U.S. Census Bureau officially estimated the country's population to be 328,239,523 as of July 1, 2019 . According to the Bureau's U.S. Population Clock, on May 23, 2020 , the U.S. population had a net gain of one person every 19 seconds, or about 4,547 people per day. The United States is the third most populous nation...
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