America has known terrorism since 1776

Peter Earnest, executive director of the International Spy Museum, discusses the museum's exhibit The Enemy Within: Terror In America -- 1776 To Today.

From www.spymuseum.org/: Most Americans remember exactly where and when they learned about terrorist attacks in America on September 11th 2001 and regard these events as a turning point that forever changed their sense of security in the United States. Were Americans safe from attack prior to this date? No. History reveals over 125 major incidents of subterfuge, terror, or violence on American soil by enemies within its borders many with deadly consequences and grave impact. Each time, Americans responded with renewed patriotism, determination, and a quandary: how can the country be made more secure without compromising the civil liberties upon which it was founded?