Digital History
Digital History: September 11, 2001
This site has a comprehensive overview of the September 11, 2001 attacks on the U.S., including information on Osama bin Laden's background, the formation of Al Qaeda, the attacks themselves, the US response, civil liberties and national...
Wikimedia
Wikipedia: War on Terror
This Wikipedia article discusses the United States counter-terrorism strategy and its controversy.
US Department of State
U.s. Dept of State: Diplomacy in Action: Patterns of Global Terrorism
This resource gives a summary of the number of terrorist attacks that occurred and where they are happening, along with charts and tables.