Final answer:
Truman responded to Cold War tensions by implementing a policy of containment, promoting capitalism and democracy while preventing the spread of communism. He provided military aid to countries fighting communism and committed US forces to the Korean War.
Step-by-step explanation:
Truman responded to Cold War tensions at home and abroad by implementing a policy of containment. This involved promoting capitalism and democracy while preventing the spread of communism beyond the 'iron curtain' in Europe. Truman also provided military aid to countries fighting against communist forces, such as Greece and Turkey, and committed US forces to the Korean War.