Why do you think Plessy based his appeal in part on the thirteenth amendment?

Plessy based his appeal in part on the Thirteenth Amendment because he aimed to argue that racial segregation constituted a form of involuntary servitude, which the amendment abolished. By framing his case within the context of the Thirteenth Amendment, Plessy sought to challenge the legality of racial discrimination and emphasize the idea that such laws degraded the dignity of African Americans. This approach allowed him to connect his personal experience of discrimination to broader constitutional principles of freedom and equality.