Answer:
1) Harry Truman made a policy of containment known as the Truman Doctrine
2) the us fought many 'proxy wars: for example, in the Vietnam war, where North Vietnam fought against south Vietnam, the USA supported the south
3) the us tried to fight the cold war by demonstrating their power and technology. one example would be where each side tried to have their best weapons and the most nuclear bombs. another example is the space race where each side tried to show that it had the better scientists and technology by accomplishing certain space missions first
