Here are some great links for each of the topics below.

Exploration	Revolutionary Sixties
Colonialism	Nixon/Carter Years: 1970's
American Revolution	The Ronald Reagan Years: 1980's
The New Nation	Bush and The Gulf War Years: 1990's
Jacksonian Democracy	The American Presidency
The Western Movement	California History
Sectionalism	History Indexes and Outlines
The Gilded Age	Texas History
The Progressive Era	Maps
World War I	Media,Science and Technology
The Roaring Twenties	News and Mass Media
The Great Depression	Sounds and Graphics
World War II	Internet Resources for Teachers
Cold War	Kids Stuff
The Nifty Fifties	Women and Minorities