The Reagan Doctrine was a strategy orchestrated and implemented by the United States under the Reagan Administration to overwhelm the global influence of the Soviet Union in an attempt to end the Cold War. The doctrine was the 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 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 end the Cold War.
The Reagan Doctrine followed in the tradition of U.S. presidents developing foreign policy "doctrines", which were designed to reflect the challenges facing international relations of the times, and propose foreign policy solutions to them. The practice began with the Monroe Doctrine of President James Monroe in 1823, and continued with the Roosevelt Corollary, sometimes called the Roosevelt Doctrine, introduced by Theodore Roosevelt in 1904.
The current post–World War II tradition of Presidential doctrines started with the 1947 Truman Doctrine, under which the United States provided support to the governments of Greece and Turkey as part of a Cold War strategy to keep those two nations out of the Soviet sphere of influence. The Truman Doctrine was followed by the Eisenhower Doctrine, the Kennedy Doctrine, the Johnson Doctrine, the Nixon Doctrine, and the Carter Doctrine, all of which defined the foreign policy approaches of these respective U.S. presidents on some of the largest global challenges of their administrations.