What is the significance of the landmark Supreme Court case Plessy v. Ferguson?

Plessy v. Ferguson, 163 U. S. 537 (1896), was a landmark decision of the U. S. Supreme Court that 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".

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Plessy v. Ferguson, 163 U. S. 537 (1896), was a landmark decision of the U. S. Supreme Court that 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".