Match the events that contributed to the fall of the soviet union with the years in which they took place.

Here are your matches for the events shown, listed by year:

I'll provide a few more details on that last item, regarding Czechoslovakia.  In January, 1968, the new leader in Czechoslovakia, Alexander Dubcek, launched the "Prague Spring" (as it became known).  He sought to give communism "a human face," as he termed it, introducing many political and economic reforms.  By August, the USSR responded by sending in 600,000 troops, and again those Soviet tanks.  The revolution was put down.

But the Soviet Union's grip in Eastern Europe weakened over the next two decades.  By 1989, a number of Eastern European nations began to upend the communist governments that had held control in their countries.  The Berlin Wall was torn down during that time also.

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b. major john c. frémont led a rebellion called the bear flag revolt.

explanation:

during the bear flag revolt, from june to july 1846, a small group of american settlers in california rebelled against the mexican government and proclaimed california an independent republic. the republic was short-lived because soon after the bear flag was raised, the u.s. military began occupying california, which went on to join the union in 1850. the bear flag became the official state flag in 1911.