Cold War

4. A period of geopolitical tension between the Soviet Union and the United States and their respective allies from 1947 to 1991.
5. The NASA mission that landed the first humans on the Moon on July 20, 1969.
7. A 1964 incident involving U.S. naval destroyers and North Vietnamese forces, leading to increased U.S. involvement in the Vietnam War.
9. A U.S. foreign policy strategy aimed at preventing the spread of communism abroad during the Cold War.
11. The first artificial satellite, launched by the Soviet Union on October 4, 1957.
12. National Aeronautics and Space Administration; a U.S. government agency responsible for the nation's civilian space program and for aeronautics and aerospace research.

1. A U.S. government department created in response to the 9/11 attacks, focusing on protecting the United States from terrorist attacks and natural disasters.
2. Violent acts intended to create fear and achieve political goals, often targeting civilians.
3. A political and economic ideology advocating for a classless society in which all property is publicly owned.
6. A conflict between North Korea and South Korea from 1950 to 1953, involving international support for both sides.
8. A conflict in Vietnam, Laos, and Cambodia from 1955 to 1975 involving North Vietnam against South Vietnam and its principal ally, the United States.
9. A 13-day confrontation in October 1962 between the U.S. and the Soviet Union over Soviet ballistic missiles deployed in Cuba.
10. A U.S. initiative launched in 1948 to aid Western Europe's economic recovery after World War II.