What is the Cold War?
The Cold War was the 46 years of hostility between the United States and the Soviet Union. There was no actual fighting between the nations. They were so adversely different from each other. The United States believed in a world that was "free" and democratic. The Soviet Union believed communism was the answer to the world's issues. Both nation's wanted to see the spread of their ideologies. These two completely different forms of government disagreed on almost everything and both wanted dominance in the world. A nuclear arms race, both nations meddling in other's business, a few hot spots of fighting between anti and pro-communist forces, and a space race later, the Soviet Union collapsed and the United States remained the sole world super power.
Video Explaining the Cold War. Accredited to John Greene and the youtube channel "crashcourse".