How did the Soviet invasion of Afghanistan contribute to the fall of the Soviet Union?

1.The Red Army lost its strength and reputation.
2.The Soviet Union used nuclear weapons illegally against Afghanistan.
3.The United States provided no military aid to Afghanistan, thereby lengthening the conflict.
4.The Soviet economy crumbled further due to the heavy military cost of the invasion.
5.Eventually, Afghanistan managed to gain the support of many Soviet satellite states.

The Soviet Invasion of Afghanistan contributed to the fall of the Soviet Union because "the Soviet economy crumbled further due to the heavy military cost of the invasion."

Explanation:

The Soviet Union invaded Afghanistan in 1979 when the Afghan government needed help from the Soviets to fight against the mujaheddin rebels.

The Mujaheddin were the guerilla fighters who rebelled against the government in Afghanistan in the 1970s. They protested against the Afghan government and the Soviet troops during the Soviet invasion.
The responsibility in the Afghanistan War, Russia economy weakened, which finally led the Soviet Union to fall.
It questioned the Red Army, formed a split between the party and the military, and showed that the Army was not strong.
The Soviet invasion of Afghanistan changed leaders views about the ability to use the military.
The military cost in the Soviet invasion also resulted in the decline of the Soviet Union.
The Soviet occupancy in Afghanistan ended in 1989 with heavy economic and military loss. Eventually, the Soviet Union ended in 1991 and was followed by Russian Federation.

The breakdown of the Soviet Union happened because of the war in Afghanistan that increasing the economic gap between the Soviet Union and domestic problems. Thus, the correct answer is option 4.

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