How did the Truman Doctrine influence U. S. foreign policy during the Cold War?
A. It led the United States to take action, as in the Berlin Airlift, to
prevent the spread of communism.
B. It required the United States to offer economic aid to both
communist states and democracies.
C. It allowed the United States to take control of former European
colonies throughout the world.
D. It reinforced the United States' decision to isolate itself from the
rest of the world.