Space Race - The United States and Soviet Union had an intense competition to see who could get to space first. It was known as the Space Race.
When World War 2 ended the US and SU found themselves in a conflict over political theory. This conflict became known as "The Cold War". Instead of Nuclear war though the countries were motivated to go to space.
April 12, 1961 - The Soviet Union became the first country to enter space. Yuri Gagarin was the first human space traveler.
Moon Race - On May 25, 1961 US President Kennedy challenged the SU to a race to the moon.
The Soviets took up the challenge and tried very hard but suffered major setbacks.
On July 20, 1969 the US Apollo 11 astronauts Neil Armstrong and Buzz Aldrin reached the Moon.