How did segregation become the key issue in the Plessy v. Ferguson case?

Plessy v. Ferguson was important because it essentially established the constitutionality of racial segregation. As a controlling legal precedent, it prevented constitutional challenges to racial segregation for more than half a century until it was finally overturned by the U.S. Supreme Court in Brownv.

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The only thing humans/ a person had to do was to think clearly and remain calm despite the stress.