A map from 1904 of the United States showing the territorial acquisitions up to the Gadsden Purchase in northern Mexico in 1853. The map is coded to show the territory of the original United States and the Northwest Territory defined by...

A map from 1912 of the United States showing the territorial acquisitions up to the Gadsden Purchase in northern Mexico in 1853. The map is color-coded to show the territory of the original United States and the Northwest Territory...

A map from 1903 of Nevada showing counties and county seats, principal cities and towns, mountain ranges, and rivers. "Nevada, one of the most western of the States of the American Union, was formed from a portion of the territory...

A map of central North America showing territorial claims at the beginning of the French and Indian War in 1755. The map shows the Oregon Country, the Spanish claims to New Spain and Florida, the French claims to Louisiana and Canada,...

A map of the United States in 1850, showing the frontier line, indicate by the thick black line. The map shows the States added to the Union between 1840 and 1850, including Florida (1845), Texas (1845), Iowa (1846), Wisconsin (1848),...

A map of the United States and Pacific Ocean showing the development of American interests in the Pacific from the early exploration of Oregon Country in 1791 to the formal annexation of the Midway Islands and the Panama Strip in 1903....

A map of North America in 1760 showing the territorial claims at the time. The map is color-coded to show the claims of the French, English, and the Spanish. The Oregon Country is also shown, however this was a region unexplored by the...

A map of the United States during the Presidency of John Quincy Adams (1825&ndash1829) showing the States at the time, the Unorganized Territory of the Louisiana Purchase, and the Oregon Country under joint control with Great Britain.

A map of the United States showing the principal trade and westward migration routes between 1840 and 1850. The map shows state and territory boundaries at the time, major cities, ports, outposts, forts, and settlements, rivers, mountain...

A map from 1899 of the United States showing the growth of the nation from the original States in 1783 to the admission of Utah into the Union in 1896. The map shows the Northwest Territory claimed at the end of the American...

A map of the United States between 1840 and 1850 showing the states and territories, and the principal routes of transportation and westward migration during the period. The map shows frontier forts, outposts, and settlements, the...