Examines the development of American foreign policy in the latter part of the 1800s, and what Frederick Jackson Turner and Alfred Thayer Mahan did to further American imperialistic interests.

[Free Registration/Login Required] A lengthy essay about American focus on foreign affairs after the Civil War, expanding particularly in the late 19th century. Read about U.S. exploits in the Caribbean, Latin America, and the Pacific...

Read about three theories of Imperialism and how actions by the United States in the late 19th and early 20th centuries were driven by one or perhaps all three of the theories.

This website gives detailed information on U.S, imperialism including lesson plans. Presented in outline format.