Background:
Britain's American colonies broke with the mother country in 1776
and were recognized as the new nation of the United States of
America following the Treaty of Paris in 1783. During the 19th and
20th centuries, 37 new states were added to the original 13 as the
nation expanded across the North American continent and acquired a
number of overseas possessions. The two most traumatic experiences
in the nation's history were the Civil War (1861-65) and the Great
Depression of the 1930s. Buoyed by victories in World Wars I and II
and the end of the Cold War in 1991, the US remains the world's most
powerful nation state. The economy is marked by steady growth, low
unemployment and inflation, and rapid advances in technology.

Geography United States

Location:
North America, bordering both the North Atlantic Ocean and the
North Pacific Ocean, between Canada and Mexico

Geographic coordinates:
38 00 N, 97 00 W

Map references:
North America

Area:
total: 9,826,630 sq km
land: 9,161,923 sq km
water: 664,707 sq km
note: includes only the 50 states and District of Columbia

Area - comparative:
about half the size of Russia; about three-tenths the size of
Africa; about half the size of South America (or slightly larger
than Brazil); slightly larger than China; almost two and a half
times the size of the European Union

Land boundaries:
total: 12,034 km
border countries: Canada 8,893 km (including 2,477 km with Alaska),
Mexico 3,141 km
note: US Naval Base at Guantanamo Bay, Cuba is leased by the US and
is part of Cuba; the base boundary is 28 km

Coastline:
19,924 km

Maritime claims:
territorial sea: 12 nm
contiguous zone: 24 nm
exclusive economic zone: 200 nm
continental shelf: not specified

Climate:
mostly temperate, but tropical in Hawaii and Florida, arctic in
Alaska, semiarid in the great plains west of the Mississippi River,
and arid in the Great Basin of the southwest; low winter
temperatures in the northwest are ameliorated occasionally in
January and February by warm chinook winds from the eastern slopes
of the Rocky Mountains

Terrain:
vast central plain, mountains in west, hills and low mountains in
east; rugged mountains and broad river valleys in Alaska; rugged,
volcanic topography in Hawaii

Elevation extremes:
lowest point: Death Valley -86 m
highest point: Mount McKinley 6,194 m