After world war 1 the United States wanted to isolate themselves from things like that because of how bad the war was. They went as far as to not join the league of nations that their President made himself with other presidents. After the Korean War, they decided to not isolate themselves and meddle as much as possible to prevent the spread of communism because it would strengthen the Soviet Union who was the main enemy.
During 1989 and 1990, the Berlin Wall came down, borders opened, and free elections ousted Communist regimes everywhere in eastern Europe. In late 1991 the Soviet Union itself dissolved into its component republics. With stunning speed, the Iron Curtain was lifted and the Cold War came to an end.
<span>The Sudetenland contained 3.5 million Germans who had been cut off from the rest of Germany after the creation of Czechoslovakia by the Treaty of Versailles. Hitler felt he had a legitimate claim upon the area because he saw it as German land. Also, Sudeten Germans claimed they were victimized by the Czech government and wanted home rule or union with Germany. Britain was reluctant to involve herself because she had inadequate armed forces to do so and had no treaty obligations to Czechoslovakia. After the Bad Godesberg and Munich conferences the four main European powers (Britain, France, Italy and Germany) decided, without the presence of the Czech leader, to give the Sudetenland to Hitler over a ten day period. The Czechs had little alternative but to agree to Hitler's demands, as they had few allies and a weak army. (However they did have an alliance with France which they failed to honor) By the 1st of October 1938 the Sudetenland had been fully surrendered to Hitler.</span>
Answer:
European nations were rival and they also wanted to get colonies to gain an advantage over their rivals plus it was a sign of prestige and power
