Why did the Soviet Union collapse?

The Soviet Union collapsed because they could not keep up with the costs of the arms race with the US, nor could they provide the proper leadership citizens were looking for. The Arms Race was very costly for the United States and the USSR, but since the USSR had just came out of World War II with very little money, they could not afford to keep producing nuclear weapons. Also, Gorbachev's implementation of a more Capitalist lifestyle gave citizens a reason to ask for more freedoms, freedoms that the Soviet Union could not give out without abandoning Communism.