Period 6 refers to the time period in AP US History from 1865 to 1898, which includes the Reconstruction era, Gilded Age, and the beginning of American imperialism.
Related terms
Reconstruction: The period after the Civil War where efforts were made to rebuild and reform Southern states, extend civil rights to freed slaves, and reunite the nation.
Gilded Age: Refers to a time of economic growth but also social inequality, political corruption, and extravagant wealth display in late 19th-century America.
American Imperialism: The policy of expanding American influence and acquiring overseas territories in order to build an empire.