Why did the Soviet Union disintegrate?

The main reason for the disintegration of the Soviet Union is that during the Cold War, the Soviet economy declined in an all-round way, its development was abnormal, and people complained bitterly. The Soviet Union intervened in socialist countries as a big brother, which led to a large number of countries in Eastern Europe breaking away from socialism. After Gorbachev came to power, he carried out reforms, which led to the collapse of the social system and the deepening of the economic quagmire. Estonia, Latvia and Lithuania seceded, and Russia, Belarus and Ukraine declared that their laws were superior to those of the Soviet Union. After the reunification of Germany, Gorbachev was placed under house arrest by the State Emergency Committee. Russian President Yeltsin immediately took action to cancel the National Emergency Committee and conveniently demanded Gorbachev to hand over the nuclear warhead package. Subsequently, the Soviet Union ended its activities in the whole country, and countries also withdrew from the Soviet Union. At 7: 38 on February 26th, 65438, the Soviet flag was lowered from the Kremlin dome, and the Soviet Union completely disintegrated.