
The country’s capital is Washington, D.C. Urbanization climbed to over 80% in 2010 and leads to growing megaregions. It is one of the world’s most ethnically diverse and multicultural nations, and is home to the world’s largest immigrant population. Īt 3.8 million square miles (9.8 million km 2) and with over 324 million people, the United States is the world’s fourth-largest country by total area (and fourth-largest by land area) and the third-most populous. The geography, climate and wildlife of the country are extremely diverse. The territories are scattered about the Pacific Ocean and the Caribbean Sea. The state of Hawaii is an archipelago in the mid- Pacific. The state of Alaska is in the far northwestern corner of North America, with a land border to the east with Canada and separated by the Bering Strait from Russia.

Forty-eight of the fifty states and the federal district are contiguous and located in North America between Canadaand Mexico. The United States of America ( USA), commonly referred to as the United States ( U.S.) or America, is a federal republic composed of 50 states, a federal district, five major self-governing territories, and various possessions. ^ Except American Samoa and the Virgin Islands.^ See Time in the United States for details about laws governing time zones in the United States.^ Whether the United States or China is larger has been disputed.

