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when Soviet forces blockaded rail, road, and water access to Allied-controlled areas of Berlin -
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Formed in 1949 with the signing of the Washington Treaty, NATO is a security alliance of 30 countries from North America and Europe. -
The Korean War was fought between North Korea and South Korea -
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The Warsaw Pact was a collective defense treaty established by the Soviet Union and seven other Soviet satellite states in Central and Eastern Europe -
The Vietnam War was a long, costly and divisive conflict that pitted the communist government of North Vietnam against South Vietnam -
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the Communist government of East Germany began to build a barbed wire and concrete wall -
a direct and dangerous confrontation between the United States and the Soviet Union during the Cold War and was the moment when the two superpowers came closest to nuclear conflict. -
two American astronauts landed on the moon and became the first humans to walk on the lunar surface. -
Starting at midnight that day, he said, citizens of the GDR were free to cross the country's borders