In which landmark case did the supreme court rule that "separate but equal" facilities were legal? a. dred scott v. sandford b. brown v. board of education of topeka c. gideon v. wainwright d. plessy v. ferguson?

Plessy v. Ferguson, 163 U.S. 537 (1896), 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".