What was the most important difference between the supreme court's rulings in plessy v. ferguson and brown v. board of education

Plessy v Ferguson rules that separate but equal was still legal in public schools while brown v board of education overturned this ruling

Ifound this on google “simply, the working conditions were terrible during the industrial revolution. as factories were being built, businesses were in need of workers. with a long line of people willing to work, employers could set wages as low as they wanted because people were willing to do work as long as they got paid.” i hope this you for what your looking for.