A map of western North America between the opening of the Oregon Trail in 1832 to 1842, prior to the establishment of the Provisional Government of Oregon by American settlers in 1843. The map shows the boundary of the Oregon Country,...

A map of the western United States and northern Mexico showing the territorial disputes settled and boundary established by the Adams-Onis Treaty between the United States and Spain in 1819. The territorial disputes involved the natural...

A map of Mexico in 1845, prior to the ceding of the northern territories to the United States in 1846. The map shows the territories of Oregon, Texas, and Central America under Mexican control, and the frontiers of the Missouri and...

A map of the United States and territories in 1821 after the Missouri Compromise, showing the Free States and territories, the Slave States and territories, and the transitional territories at the time. The map is color-coded to show the...

A map of the Oregon Country showing the adjustments to the boundaries between 1818-1846, including the boundary established in 1818 to the east of the jointly controlled territory (Great Britain and the United States), the southern...

A map of the United States showing the growth of the nation from 1783-1867. The map is color-coded to show the thirteen original states, the territory acquired by conquest during the revolution and the Treaty of 1783, the Louisiana...

A map from 1911 of the United States showing the territorial acquisitions from the original states and territory established in 1783 to the Tripartite Convention of 1899 in which Germany and the United States divided the Samoan...

A map from 1872 of the United States used to illustrate the comparative area sizes of the states to other countries in the world. The map shows state and territory boundaries at the time (Dakota, Montana, Washington, Idaho, Wyoming,...

Here's a map to show you when states were added to the Union. It also shows territories and when they were acquired.

A map from 1920 of the United States and its territories between 1783 and 1900 showing the nation's expansion and date of acquisition of each new territory or possession. The map is color-coded to show the progression from the original...

A map from 1904 of Oregon showing the capital of Salem, principal cities and towns, railroads, stage lines, mountains, rivers, and coastal features. "Oregon - Organized as a Territory in 1848; became a state in 1859. Area, 96,030 square...

A map from 1885 of the United States showing the territorial growth from the original States and the Northwest Territory in 1783 to the Russian cession of Alaska in 1867. The map is color-coded to show the progression from the original...

A map from 1897 of the United States showing the territorial growth from the original States and the Northwest Territory in 1783 to the purchase of Alaska from Russia in 1867. The map is color-coded to show the progression from the...

A map from 1897 of the United States showing the territorial growth from the original States and the Northwest Territory in 1783 to the purchase of Alaska from Russia in 1867. The map is color-coded to show the progression from the...

A map from 1894 of the United States showing the territorial growth from the original States and the Northwest Territory in 1783 to the Russian cession of Alaska in 1867. The map is color-coded to show the progression from the original...

A map from 1911 of the United States showing the territorial growth from the original States and the Northwest Territory in 1783 to the Gadsden Purchase of 1853. The map is color-coded to show the progression from the original thirteen...

A map from 1898 of Oregon showing the capital of Salem, principal cities and towns, railroads, mountain systems, lakes, rivers, and coastal features. "Oregon, name derived from Spanish word signifying 'Wild Thyme,’ so called on account...

A map of the western United States in 1840-1850 showing the Oregon Trail and Santa Fe, the two principal overland routes from Independence, Missouri, to the western territories and the Pacific. The map shows the territory boundaries,...

A map of the Oregon Country showing the adjustments to the boundaries between 1819-1846, including the southern boundary established by treaty with Spain in 1819, and the boundary dividing the territory between the United States and...

A map of the United States in 1830 showing the states and territories, the joint-occupation with Britain in Oregon Country, and the British and Spanish possessions at the time. The map shows the westward expansion of the United States,...

A map of the United States in 1803 showing the extent of the territory after the Louisiana Purchase from France. The map is color-coded to show the possessions of the United States, Great Britain, and Spain at the time, and shows the...

A map of the United States in 1821 showing the extent of the territory after taking control of Florida from Spain. The map is color-coded to show the possessions of the United States, Great Britain, and Spain at the time, and shows the...

A map of the United States in 1801 showing the extent of the territory at the time of the presidency of Thomas Jefferson. The map is color-coded to show the possessions of the United States, Great Britain, Spain, and France at the time,...

A map of the present day territory of the United States, showing the European claims to the land before 1763 and the end of the French and Indian Wars. The map shows the claims of the British, French, and Spanish, and shows the...