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Selective incorporation is a constitutional doctrine that ensures states cannot enact laws that can take away the constitutional rights of U.S. citizens that are included in the Bill of Rights.
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Historians have often cited Truman's address, which came to be known as the Truman Doctrine, as the official declaration of the Cold War. ... The Truman administration believed that both nations were threatened by communism and it jumped at the chance to take a tough stance against the Soviet Union.