The failing communist governments entrenched the idea that democracy was superior form of government. It established the United States as a global superpower both in governmental structure and military force. The failing governments also meant that Eastern Europe was much less financially stable than the rest of the world and would have to make peace with and rely on western countries to pull themselves out of debt.
Communism was already very weak, but the Communist leaders of East Germany decided that East Germany just need some moderate change to release the tension.
In November 1989 an announcement was made by the East German Communist party that they will allow the east German that they are free to cross the borders.
Later, the Berlin wall was flooded with the people from both sides and they fall the wall without the Soviet support, the East German government let go of their power.
President Dwight D. Eisenhower was the first president to explain the domino theory, although he never actually called it the domino theory. He was explaining it in regards communism in Southeast Asia.
