The Marshall Plan, American military aid to South Vietnam, and the Bay of Pigs invasion are examples of which of the following U.S. foreign policies during the twentieth century?

The Marshall Plan, American military aid to South Vietnam, and the Bay of Pigs invasion are all key components of the Containment policy, which aimed to prevent the spread of communism during the Cold War.

The Marshall Plan, officially known as the European Recovery Program, was a significant financial aid initiative that provided over $13 billion to help rebuild Western European economies after World War II. This was driven by the fear that economic instability could lead to the rise of communist movements in those countries. By promoting economic recovery and stability, the United States sought to contain the influence of the Soviet Union in Europe.

American military aid to South Vietnam exemplifies containment as well, as it represented the U.S. effort to support a non-communist government in a region threatened by communism. The U.S. believed that aiding South Vietnam would prevent the domino effect of neighboring countries falling to communism, which further illustrates the strategic goal of containment.

The Bay of Pigs invasion was an attempt to overthrow the Cuban government led by Fidel Castro, who was aligned with the Soviet Union. This operation underscored the U.S. commitment to containing communism in Latin America by attempting to reestablish a government that would be friendly to U.S. interests,