How did the supreme court justify its ruling in the case of plessy v. ferguson?

Plessy v. Ferguson was a landmark decision of the U.S. Supreme Court issued in 1896. It upheld the constitutionality of racial segregation laws for public facilities as long as the segregated facilities were equal in quality – a doctrine that came to be known as "separate but equal"

by creating a labor shortage that pushed the continent toward a market economy

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