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What general principle was established with the Plessy v. Ferguson Supreme Court decision?

A. States could not prevent African Americans from voting.
B. States could be punished with decreased congressional representation if they did not allow African Americans to vote.
C. States could require separate facilities for African Americans as long as the facilities were equal.
D. States could not use poll taxes and literacy tests to establish voting eligibility.

It's C. States could require separate facilities for African Americans as long as the facilities were equal.

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martin luther king (1929-1968) was an activist for the african american rights, mr. king has a profile of a kind leader that built a tenacity, respect and full of hope future. he was an activist through civil disobedience and no violence pressure mechanisms. he tried to build a more egalitarian and fair society. his efforts carried a reivindication message of the civilian rights to every west corners. for that reason, he won the nobel prize in 1964.