Johnson Doctrine

The Johnson Doctrine, enunciated by U.S. President Lyndon B. Johnson after the United States' intervention in the Dominican Republic in 1965, declared that domestic revolution in the Western Hemisphere would no longer be a local matter when "the object is the establishment of a Communist dictatorship". It is an extension of the Eisenhower and Kennedy Doctrines.

The U.S. government was fearful of communist influence in the Western Hemisphere during the Cold War. In the 1960s, the Dominican Republic was one particular country of interest. As a result of ongoing political turmoil in the county, Dominican generals revolted in April of 1965. Fearful that the members of the revolt had communist sympathies, the United States invaded the country on April 28 to reestablish a government sympathetic to the United States.

The Johnson Doctrine reenforced the United States government's existing doctrines against communist expansion. In his May 2 address, Johnson specifically states that the American countries, "will not permit the establishment of another Communist government in the Western Hemisphere". The Johnson Doctrine builds off of the Kennedy and Eisenhower doctrines in that it opposes communism in the Western Hemisphere. It also parallels the Monroe Doctrine, with an emphases on denouncing outside (in this case communist) interference in the Americas.

...
Wikipedia