Why did communism in the soviet union collapse in the late 1980s?

consider:

political factors: what did leaders in the soviet union, the united states, and europe do to further the fall of communism?
military factors: what effect did military policies and actions in the united states and in the soviet union have?
economic factors: what effect did the economic situation in the soviet union have?
social/cultural factors: what was the attitude of the people of the soviet bloc countries? what impact did glasnost have? what was the impact of dissidents?

the Soviet Union fell due to World War 2, when the Allied Nations defeated the Natzies.

Gorbachev's decision to allow elections with a multi-party system and create a presidency for the Soviet Union began a slow process of democratization that eventually destabilized Communist control and contributed to the collapse of the Soviet Union.

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1. explain aspects of the democratic process as it was developed in ancient athens

2. trace the roots of the americans political process to ancient athens

3. explain the relationship of citizens to the political process