It would be the year "1991" that the Soviet Union officially "dissolved"--although it should be noted that the USSR was showing signs of dissolving long before this.
To control them from having too much power. if they have too much power then bad things could happen like having new laws because of personal opinion.
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Lincolns Ten Percent Plan required that 10% of its voters swear loyalty to the U.S. in order to form a new government. so the awnser is
D) 10%
