Final answer:
The major goal of the United States was to contain communism.
Step-by-step explanation:
The major goal of the United States taking actions such as U.S. President Johnson stationing warships off the Dominican coast, the U.S. CIA helping engineer a truck drivers' strike that paralyzed Chile, and U.S. CIA urging the Chilean military to take action was to contain communism. During the Cold War, the United States was concerned about the spread of communism and sought to prevent its expansion beyond Eastern Europe.