Overview
The Nixon Doctrine (also known as the Guam Doctrine) was put forth during a press conference in Guam on July 25, 1969, by President of the United States Richard Nixon and later formalized in his speech on Vietnamization of the Vietnam War on November 3, 1969. According to Gregg Brazinsky, author of "Nation Building in South Korea: Koreans, Americans, and the Making of a Democracy", Nixon stated that "the United States would assist in the defense and developments of allies and friends", but would not "undertake all the defense of the free nations of the world." This doctrine meant that each ally nation was in charge of its own security in general, but the United States would act as a nuclear umbrella when requested. The Doctrine argued for the pursuit of peace through a partnership with American allies.
Background
At the time of President Nixon's first inauguration in January 1969, the US had been engaged in combat in Vietnam for almost four years. The war had so far killed over 30,000 Americans and several hundred thousand Vietnamese citizens. By 1969, US public opinion had moved decisively to favoring ending the Vietnam War; a Gallup poll in May showed 56% of the public believed sending troops to Vietnam was a mistake. Of those over 50 years old, 61% expressed that belief, compared to 49% of those between ages 21 and 29, even if tacit abandonment of the SEATO Treaty was ultimately required and caused a complete communist takeover of South Vietnam despite previous US guarantees. Because Nixon campaigned for "Peace with Honor" in relation to Vietnam during the 1968 presidential campaign, ending the Vietnam War became an important policy goal for him.
The Nixon Doctrine
During a stopover during an international tour on the U.S. Territory of Guam, Nixon formally announced the Doctrine. Nixon declared the United States would honor all of its treaty commitments in Asia, but "as far as the problems of international security are concerned ...
From Wikipedia (CC BY-SA 4.0).