What was the reason for the collapse of the Soviet Union

The collapse of the Soviet Union was caused by a combination of economic, political, and social factors. The Soviet economy was inefficient and unable to compete with the economies of the West. Political reforms, such as glasnost and perestroika, led to increased freedom of expression and the rise of nationalist movements in the Soviet republics. The Soviet Union's inability to respond to these changes, combined with its military involvement in Afghanistan, led to its eventual collapse.