Islam spread into Europe in 1543
The answer is McCarthyism.
During this period, the U.S. was determine to prevent the spread of
communism in its territories.
Surveillance and warrantless arrest of suspects were rampant. Many lost their careers after being branded a
communist while others were put in jail.
Many criticized this actions as unconstitutional.
Disagreements over state's rights, slavery, and other issues, the Civil War occurred when the tensions finally grew too much.
Soviet-war and Vietnam war
