USA Information

The United States, an economic and military super power of contemporary times, is geographically bound by Canada and Mexico in North and South as well as by North Atlantic Ocean and North Pacific Ocean in the East and West respectively. USA travel is also a nation of many ethnicities and modern cultural and political values. Actively participating in the humanitarian missions in several continents, this rather relatively young nation is also a front runner of democratic ideals. Learn A to Z about United States in this section presented by Maps of World.

Capital	Washington, D.C.
Official language(s)	None at federal level; English de facto
Government President Vice President	Federal republic Representative democracy Barack Obama (D) Joe Biden (D)
Independence Declared Recognized	From the British July 4, 1776 September 3, 1783
Constitution Completed Ratified Effective	September 17, 1787 May 23, 1788 March 4, 1789
Area	9,631,418 km2(3rd)
Largest city	New York City
Population 2006 est. 2000 census 2000 census Density	299,598,000 (3rd) 281,421,906 32/km2 (140th) 83/mi2
GDP (PPP) Total Per capita	2006 estimate $12.370 trillion (1st) $41,800 (4th)
Currency	Dollar ($) (USD)
Time zone Summer (DST)	(UTC-5 to -10) (UTC-4 to -10)
Internet TLD	.us .gov .edu .mil .um
Calling code	1