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.