Expand the causes and consequences of the collapse of the USSR in 1990-1991.

The main reason was the systemic crisis of the state. This was also facilitated by incompetence on the part of the party nomenklatura, which led the country to a dead end. In principle, she also wanted to disunite the state in order to earn money locally. The consequences were that a number of new independent states appeared in which the economy was significantly collapsed due to the fact that it was necessary to switch from a planned format to a market one, and the old ties between the economies were broken and could not immediately improve.