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The correct answers are
It established a new precedent in declaring the law constitutional- This ruling states that the laws that allow segregated for citizens in America was legal, as long as the facilities provided were "equal."
It limited the rights of African American citizens- This case ruled in favor of seperate but equal facilities, resulting in African Americans receiving second class treatment in American society.
It allowed the policy of seperate but equal to continue- This law would continue from the 1890's all the way through the middle of the 1950's.
The effects of the case includes establishment of new precedent in declaring the law constitutional, limited the rights of African American citizens and stopped states from creating segregation laws.
The case of Plessy v. Ferguson was ruled by the Supreme Court and states that the segregation was legal as long as equal facilities were provided for both races.
However, there are argument that segregation law violated the Equal Protection Clause of the Fourteenth Amendment.
Therefore, The Option B, C and D is correct because the after-effect of the case led to establishment of new precedent in declaring the law constitutional, limited the rights of African American citizens and stopped states from creating segregation laws.
Learn more about Plessy v. Ferguson here
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