What are the main event which lead to the collapsed of soviet union ( the main point )

Gorbachev's decision to loosen the Soviet yoke on the countries of Eastern Europe created an independent, democratic momentum that led to the collapse of the Berlin Wall in November 1989, and then the overthrow of Communist rule throughout Eastern Europe.

Explanation:

for more info refer to this site

https://history.state.gov/milestones/1989-1992/collapse-soviet-union

the big stick policy was to still look powerful, and be nice at the same time. the big stick policy was also to countries who were at war, find peace with eachother.

the dollar diplomacy was to expand american business and get it to latin america, for that would be good for the economy.

you my friend, your regards.

agubaba khaleekha.

the answer is b. i did this test and got it right.