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eBook
OpenStax

Open Stax: American Foreign Policy 1890 1914: Turner, Mahan, and Roots of Empire

For Students 11th - 12th
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.
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Website
Gilder Lehrman Institute of American History

Gilder Lehrman Institute: History Now: Empire Building

For Students 9th - 10th
[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...