OpenStax
Open Stax: American Foreign Policy 1890 1914: Turner, Mahan, and Roots of Empire
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.
Gilder Lehrman Institute of American History
Gilder Lehrman Institute: History Now: Empire Building
[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...