Why does the majority maintain that jim crow law that forbade homer plessy from riding in a white only rail is constitutional

The majority opinion in the case Plessy vs. Ferguson was written by Supreme Court justice Henry Brown. In this opinion, he wrote that the Jim Crow laws that segregated blacks and whites in society did not violate the 14th amendment.

 In his argument, he discussed how the 14th amendment and the equal protection clause were focused on creating legal equality. In this case, Plessy had the chance to sit in a rail car of equal quality. This helped to develop the concept of "separate but equal" which would be used in American society for the next 6 decades.