According to the Supreme Court ruling in the Plessy versus Ferguson case, why was segregation acceptable?

Question

Segregation was legal because African-Americans were not citizens
Segregation was legal as long as the facilities for blacks and whites were equal

Answer 1

The Supreme Court ruling in the Plessy v. Ferguson case stated that segregation was acceptable as long as the facilities for African-Americans and whites were "separate but equal." This legal principle justified segregation based on the notion that separate facilities for different races did not inherently imply inequality.