The collapse of the Soviet Union in 1980s

Examine the collapse of the Soviet Union in 1980s. Include the following in your discussion:

What were the main reasons for the collapse?
What role did the constant state of militarism and the costs of keeping up with the U.S. military buildup have on the Soviet economy?
What role did uprisings and rebellions in Poland, Czechoslovakia, Hungary, and East Germany (among others) have on the sudden collapse of the USSR?