Answer:
Plessy challenged the Louisiana law segregating train cars by refusing to leave the white seating area.
Step-by-step explanation:
During the time when Plessy v. Fergusson was brought to court, most of the states In USA implemented a segregation law. The segregation law prevented the black citizens from using the infrastructures that resided only for white citizens.
Plessy felt that this law was unconstitutional. So, he challenged the Segregation law in Louisiana by sitting on part of trains that resided only for white people. But in the end, the Court ruled against Plessy and segregation law still continue to be implemented n Louisiana.