What led to the declined of the Soviet union economy?

There were several factors that contributed to the decline of the Soviet Union economy, including:

1. Centralized planning: The Soviet economy was based on central planning, which led to inefficiency, lack of innovation, and an inability to respond to changing market conditions.

2. Lack of incentives: The Soviet system did not provide individuals with incentives to work hard or innovate, as resources were allocated by the state rather than through market forces.

3. Decline in productivity: As a result of inefficiencies and lack of incentives, productivity in the Soviet economy stagnated, leading to a decline in output and economic growth.

4. Dependence on resource exports: The Soviet economy was heavily dependent on exports of natural resources, such as oil and gas, which left it vulnerable to fluctuations in global commodity prices.

5. Military spending: The Soviet Union devoted a significant portion of its GDP to military spending, which diverted resources away from productive sectors of the economy.

6. Bureaucracy and corruption: The Soviet system was plagued by bureaucratic inefficiency and corruption, which hindered economic growth and innovation.

7. Overextension: The Soviet Union's attempts to expand its influence around the world, including military interventions in Afghanistan and Eastern Europe, strained its resources and further contributed to economic decline.

These factors, among others, ultimately led to the collapse of the Soviet Union in 1991.