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The Reagan Doctrine had a significant impact through the increased U.S. military engagement in various conflicts during the 1980s. This policy was formulated under President Ronald Reagan and aimed to counteract the influence of the Soviet Union throughout the world, particularly in regions seen as strategically important to U.S. interests.

The doctrine fundamentally shifted U.S. foreign policy by supporting anti-communist guerrillas and resistance movements in countries such as Nicaragua, Afghanistan, and Angola. This culminated in increased military assistance and resources being provided to these groups, reflecting a more active and interventionist approach to foreign policy compared to previous administrations.

Thus, the adoption of the Reagan Doctrine represented a decisive shift toward direct involvement in international conflicts where communist movements were present, marking a key phase in the Cold War as the U.S. sought to roll back Soviet influence globally.