A map from 1872 of the country east of the Mississippi showing the newly formed United States after the ratification of the Constitution in 1789. The map is keyed to show the states at the time and the Spanish territories of West 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...

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