What argument did plessys legal team make in plessy vs Ferguson?

In Plessy v. Ferguson, Plessy's legal team argued that the Louisiana law mandating racial segregation on public trains violated the Equal Protection Clause of the 14th Amendment. They contended that the law enforced a system of racial discrimination that denied African Americans their civil rights and dignity. Additionally, they claimed that the law was inherently unjust and unconstitutional because it treated individuals differently based solely on race. Ultimately, their arguments were rejected by the Supreme Court, which upheld the "separate but equal" doctrine.