Which policy was introduced by President Reagan during the 1980s to combat communism?

The Reagan Doctrine was a significant foreign policy initiative introduced by President Ronald Reagan during the 1980s aimed at combating the spread of communism globally, particularly in Latin America, Africa, and Asia. This doctrine was characterized by the United States' support for anti-communist insurgent groups and governments. Reagan believed that actively opposing communist movements abroad was essential to containing and rolling back Soviet influence.

The Reagan Doctrine underscored a shift from preceding policies that primarily focused on containment. It was heavily motivated by the belief that the U.S. should promote and support nations and movements resisting communism, sometimes through the provision of military aid, training, or direct intervention. Examples include support for the Contras in Nicaragua and the Mujahideen in Afghanistan.

The other options listed—like the Gulf of Tonkin Resolution, the Truman Doctrine, and the Marshall Plan—represent earlier policies or actions that were not specific to Reagan's era or did not align with his approach in combating communism. The Gulf of Tonkin Resolution related to Vietnam, the Truman Doctrine established a policy of containment in the late 1940s, and the Marshall Plan focused on European economic recovery post-World War II. Thus, the Reagan Doctrine is distinct as it encapsulates Reagan