Plessy based his appeal in part of the thirteenth amendemnt because the Thirteenth Amendment abolished slavery and this was just another form of slavery after the Civil War.
Or
Plessy based his appeal in part of the thirteenth amendement because it banned 'involuntary servitude' and segragation of rairoad cars was a form of such servitude.
Or
After being found guilty by thr Loisiana Supreme Court. Plessy argued that his imprisonment and the state law were unconstitutional due to violating the thirteenth and fourteenth amendments
Explanation:
