How did Jim Crow laws undermine the Fourteenth Amendment?

Plessy v. Ferguson, the court rejected Plessy's arguments that the Louisiana Jim Crow law violated his constitutional rights under the 13th and 14th Amendments ... He also ruled that the 14th Amendment was not intended to enforce the social equality of the races in America.

In Plessy, the Supreme Court said segregation was constitutionally acceptable as long as the facilities were equal ... In Brown v. Board of Education of Topeka in 1954, the court decided that "separate educational facilities are inherently unequal