Presidential Assassinations and Assassination Attempts (About.com American History)
An interesting history-related post from About.com American History:
Since the founding of the United States, four Presidents have been assassinated while in office. An additional six presidents were subject to assassination attempts. President Gerald Ford was actually subject to not just one but two assassination attempts, both by women. Learn more about each assassination and attempt on President of the United States.
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Learn more on this topic from our recommended AP history review books.