Final answer:
One year after the Berlin Wall was struck down, revolutions took place across Central and Eastern Europe, leading to the collapse of Communist governments and the reunification of Germany.
Step-by-step explanation:
One year after the Berlin Wall was torn down in November 1989, several significant events took place. The collapse of the Berlin Wall was followed by a wave of revolutions across Central and Eastern Europe, leading to the collapse of Communist governments in many countries. This eventually led to the reunification of Germany in 1990. Additionally, changes took place in the Soviet Union, such as the resignation of Mikhail Gorbachev as President of the USSR in 1991 and the dissolution of the USSR itself.