Smithsonian Institution
National Portrait Gallery: 1846: Portrait of a Nation
This site provides a glimpse into the United States in the year 1846. James Polk was president and the Westward Expansion was in full force. The site has nice historical photographs.
Independence Hall Association
U.s. History: Pearl Harbor
A concise look at the economic relations between Japan and the United States just prior to the Japanese attack on Pearl Harbor. Find out what the Japanese hoped to achieve with the attack, and read about the American response.
Other
On Line History of the United States: The Age of Imperialism
Online history page containing numerous links to specific incidents of U.S. expansion in the Pacific, Latin America, China, and Cuba.
PBS
Pbs: American Experience: The Spanish American War in the Philippines (1898)
After giving a general summary of the Spanish-American War in the Western Hemisphere, the course of the war as waged in the Philippines is explained. See how the Philippines was annexed to the United States.
University of Virginia
Miller Center at Uva: u.s. Presidents: Franklin Delano Roosevelt: Foreign Affairs
Scroll through this discussion of Franklin Roosevelt's attention to foreign policy during his several terms in office to "Confronting Germany and Japan" and "Descent into War." Here you will find out about the United States' position of...
Independence Hall Association
U.s. History: Reactions to a Troubled World
Read about the rising militarism and fascism in Europe and Asia as dictators expanded their territories. See how the United States reacted with its series of three neutrality acts.