Question

The announcement of the Truman Doctrine, the

Answer 1

The announcement of the Truman Doctrine, the Berlin airlift, and the formation of the North Atlantic Treaty Organization (NATO) were actions taken by the United States to prevent the "(2) expansion of communism into Western
Europe," since the Cold War had begun immediately after World War II ended. 

Answer 2

The correct answer is 2.

The US had adopted the containment strategy, a foreign affairs approach which focused on stopping the spread of communism worldwide, through the implementation of the Truman Doctrine. Therefore, financial aid was sent through the Marshall Plan, aiming to contribute to rebuilding Western Europe under the influence of the US, which was beneficial because the Western European powers would side with the US and act as a barrier for containing communism, that was in fact suceeding on the Eastern regions of the continent. The US and its Western allies signed the NATO agreement as a treaty for collective defense against communism.