TERRORIST ATTACKS AND PRESIDENTS
This author compiled a pair of graphs to illustrate incidents of terrorism during each of the last three presidents, including President Obama, as a means of locking down what happened and when.
In terms of methodology, he covered the following types of terrorist attacks against American personnel, civilians and interests:
1) Domestic (Abortion-related attacks, Oklahoma City, Unabomber, Anthrax)
2) Domestic Islamic (9/11, WTC 1993, Beltway Snipers, Chapel Hill)
3) Overseas Islamic (Iraq, Afghanistan, USS Cole, Embassy Bombings)
4) Known Failed Attempts (Shoe Bomber, Underpants Bomber)
5) Overseas Attacks Against U.S. Allies (London, Madrid).
These categories should cover the basic forms of terrorist attacks against Americans whether abroad or on our soil.
http://www.bobcesca.com/blog-archives/2010/01/terrorist_attac.html