How was excellence rewarded in athens

What was the main argument of plessy in plessy v. ferguson

The first william swain letter is full of optimism regarding his journeys, yet he says, " would advise no man to come this way to california." list at least two details presented in his letter to explain why he would say this. (site 1)

In what ways did robber barons/captains of industry harm and benefit the u.s. economy?