I believe the correct answer is B, correct me if im wrong
The main reason why the United States involved itself in a civil dispute on the Korean peninsula in the 1950s was "<span>to exercise the policy of containment," since they were attempting to stop the spread of communism. </span>
Because
The government viewed Cuba as a nation in need of independence. Granted, the U.S. wanted Cuba independence from Spain so that the U.S. could exert indirect political and economic control over the nation, its peoples, and its resources.
secondary source
In scholarship, a secondary source is a document or recording that relates or discusses information originally presented elsewhere.