Which event is often cited as a major factor leading to the end of the Soviet Union in 1991?

Question

The fall of the Berlin Wall
The space race with the USA
The Cuban Missile Crisis
The rise of the KGB

Answer 1

The event often cited as a major factor leading to the end of the Soviet Union in 1991 is the fall of the Berlin Wall. The fall of the Berlin Wall in 1989 symbolized the collapse of communist regimes in Eastern Europe and was a pivotal moment in the decline of Soviet influence, ultimately contributing to the disintegration of the Soviet Union itself.