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), in which a northern Union of states defeated a secessionist Confederacy of 11 southern slave states, and the Great Depression of the 1930s, an economic downturn during which about a quarter of the labor force lost its jobs. 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.There are specific maps created for every purpose. The United States federal government produces hundreds of maps of the United States, ranging from general reference maps to thematic maps which focus on United States history, resources, agriculture, transportation, military installations, recreational areas, and other themes. Commercial map makers also produce thousands of general and thematic US maps, in forms ranging from atlases to classroom wall maps to small, pocket-sized road maps.
A wealth of United States maps is stored in the vaults of map libraries, historic societies, and land offices. In most cases, the original maps may be examined onsite, but some map sources such as the Library of Congress and the National Archives offer reproductions for a fee.
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