Ushered into office prematurely, this president signed the Civil Rights Act of 1964 into law. Name that activist.

Lyndon B. Johnson stepped into some big shoes when JFK was assassinated in 1963. Johnson is credited with signing into law the comprehensive civil rights legislation, the Civil Rights Act of 1964. During his term, he also extended America's participation in the Vietnam War – by most accounts, a not-so-popular decision.

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