What law was challenged in the plessy v. Ferguson case?

This was an order issued during the civil war by president lincoln ending slavery in the confederate states

What mountain range is located near 60*n and 60*e

According to robert kennedy, how might the historian see 1962a. as a year of resistance by the southb. as a year of great progress in civil rightsc. as a year of rioting and violenced. as a year of resegregation