sentences:  The doctrine was a centerpiece of United States foreign policy from the early 1980s until the end of the Cold War in 1991.Under the Reagan Doctrine, the United States provided overt and covert aid to anti-communist guerrillas and resistance movements in an effort to "roll back" Soviet-backed pro-communist governments in Africa, Asia, and Latin America.The doctrine was designed to diminish Soviet influence in these regions as part of the administration's overall strategy to win the Cold War.