How did the Brown v. Board of Education decision affect the Supreme Court's earlier decision in Plessy v. Ferguson? A. It gave the decision more legitimacy.

B. It upheld the decision.

C. It overruled the decision.

D. It expanded on the decision.

In an effort to preserve the balance of power in Congress between slave and free states, the Missouri Compromise was passed in 1820 admitting Missouri as a slave state and Maine as a free state.

Explanation:At the time, there were 22 states, half of them free states and half of them slave states. The Senate passed a bill allowing Maine to enter the Union as a free state and Missouri to be admitted without restrictions on slavery.