Today, sixty senators must agree to invoke cloture to close off debate in the Senate

The United States had felt relatively immune from terrorism until the:

A. 1950s B. 1960s C. 1970s D. 1980s E. 1990s

Which of the following is known as the "Lame Duck Amendment"?

A) Seventeenth Amendment B) Twentieth Amendment C) Twenty-first Amendment D) Twenty-seventh Amendment E) Thirtieth Amendment