United States Acquisition of Territory, 1853
A map 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 (1783), the Louisiana ...

The United States, 1859
A map from 1859 of the United States showing State and territory boundaries at the time, capitals and major cities, mountain systems, plains, lakes, rivers, and coastal features of the area....

The United States, 1861
A map of the United States in 1861 after the secession of the Southern States. The map is color–coded to show the Free Union States, Union Slaveholding States, Confederate States, and the territories of Washington, Dakota, Nevada, Utah, Nebrask...

Reconstruction in the South, 1862–1877
The process of Reconstruction in the South after the Civil War. ...

The Louisiana Purchase, 1865–1898
A map of the Louisiana territory purchased from France in 1803, and the boundary established with the western Spanish territory by the purchase. The map overlays the current State boundaries to show the extent of the territory....

The Expanding United States, 1865–1898
A sketch map from 1899 of the western United States showing the present state boundaries (dashed lines) and states proposed between 1865 and 1898 (solid lines), including the states Yellowstone, Wallowa, West Dakota, South Colorado, and Rio Grande....

United States Expansion and the Railroads, 1880
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 and 1860 ...

The New West, 1889–1912
A map of the western United States showing the rapid growth of the New West between 1885 and 1912 during the presidencies from Benjamin Harrison to Howard Taft. The map is color–coded to show the States admitted to the Union before the American...

Admission of States to the Union, 1899
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 Revolutionary War, the Lo...

Territories of the United States, 1900
A map from 1909 showing territories added to the United States: Alaska (1867), Hawaii by annexation (1898), and Puerto Rico and the Philippines after the Spanish–American War (1898)....