A map of the United States and territories showing the expansion from the formation of the original states to 1880, and the railroad network in 1880. The map is color-coded to show the original states, the states admitted between 1791...

A base map showing the expansion of the United States resulting from the Louisiana Purchase in 1803.

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 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 1913 of the United States showing its acquisition of territory from the original states and Northwest Territory after the American Revolutionary War in 1783 to the Gadsden Purchase in 1853. The dates for each acquisition are...

The United States, showing the growth of territory from 1783 to 1867.

A map of the American Northwest Territory showing the boundary developments in 1790, 1800, and 1810. The upper left map shows the territory acquired by the United States from Britain after the Revolutionary War as established by the...

A map of the United States showing the extent of the country prior to, and after the Louisiana Purchase from France in 1803.

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 of the United States and territories showing the expansion from the formation of the original states to the purchase of the Danish West Indies (Virgin Islands) in 1917. The map is color-coded to show the original states, the states...

A map of the United States and territories showing the westward expansion after the Missouri Compromise (1820) and the admission of Missouri into the Union in 1821.

A map from 1889 of North America showing the expansion in the region of the United States from the original Thirteen Colonies at the end of the Revolutionary War in 1783 to the time the map was made, around 1889, before the territories...

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 1911 of the United States and its territories between 1783 and 1900 showing the nation's expansion and date of acquisition of each state or territory. The map also shows major cities, waterways, and mountain ranges. Includes...

A map from 1912 of the United States and its territories between 1783 and 1900 showing the nation's expansion and date of acquisition of each state or territory. The map also shows major cities, waterways, and mountain ranges. Includes...

Interactive and animated maps and timelines of historical events and time periods in American history from pre-European times until post-World War II.

A map from 1919 showing the mean center of population of the United States, calculated at each census from 1790 to 1900. The map illustrates the westward expansion of territory and migration during the period. "The center of population...

A map of the United States showing the population distribution in 1850. The map is coded to show population densities ranging from under 2 inhabitants per square mile to over 90 inhabitants per square mile. The map illustrates the...

A map from 1912 of the United States, subtitled "Distribution of Population and Railways in 1900" showing the increase in population and expansion of the railroad network since 1850. The map is color-coded to show population densities...

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...

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 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 of the southern United States showing the area and battle sites of the Creek War of 1813, also known as the Red Stick War. The map shows the Upper Creek territory along the Alabama and Tallapoosa rivers, Fort Mimms near the Battle...