Harry S. Truman

Atomic Bombings of Hiroshima and Nagasaki: These were two nuclear attacks carried out by the United States against Japan in August 1945, which led to Japan's surrender and ended World War II.

Marshall Plan: An American initiative passed in 1948 that provided over $12 billion (nearly $100 billion in current dollar value) in economic assistance to help rebuild Western European economies after the end of World War II.

Cold War: A period of geopolitical tension between powers in the Eastern Bloc (the Soviet Union and its satellite states) and powers in the Western Bloc (the United States, its NATO allies, and others), following World War II.