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Largest ancestry groups by county, 2000. As of March 1, 2013, the United States had a total resident population of 315,585,000, [ 1 ] making it the third most populous country in the world. [ 2 ] It is a very urbanized population, with 82% residing in cities and suburbs as of 2008 (the worldwide urban rate is 50.5% [ 3 ] ). This leaves vast expanses of the country nearly uninhabited. [ 4 ] California and Texas are the most populous states, [ 5 ] as the mean center of United States population has consistently shifted westward and southward. [ 6 ] New York City is the most populous city in the United States . [ 7 ]
The United States Census Bureau (officially the Bureau of the Census , as defined in Title 13 U.S.C. § 11 ) is a principal agency of the U.S. Federal Statistical System responsible for producing data about the American people and economy . The primary mission of the Census Bureau is conducting the U.S. Census every ten years, which allocates the seats of the U.S. House of Representatives to the states based on their population. [ 1 ] In addition to the decennial census, the Census Bureau continually conducts dozens of other censuses and surveys , including the American Community Survey , the U.S. Economic Census , and the Current Population Survey . [ 1 ] .
Abortion in the United States deals with the ongoing debate in the United States of abortion -related issues. Various anti-abortion laws had been on every state statute book since at least 1900. Abortion was prohibited in 30 states and legal under certain circumstances (such as pregnancies resulting from rape, incest, and date drug.) in 20 states. The Supreme Court 1973 decision Roe v. Wade invalidated all of these laws, and set guidelines for the availability of abortion.