Here are a list of precedents for the case.
Civil Rights Cases (1883): The act of an individual owner who refuses accomodations for colored people, cannot justly be regarded as imposing a badge of slavery or servitude upon colored people.
Strauder v. West Virginia (1879): A west Virginia law limiting juries to white males was a discrimination which implied a legal inferiority in civil society.
Hall v. De Cuir (18):
Louisville, N.O.&T.Ry.Co. v. State (18): A railway company was indicted for violating a state law that required all railroads to provide equal but separate accomodations for the white and colored races.
Gibson v. State (1896): The constitution of the United States forbids so far as civil and political rights are concerned, discrimination by the general government or the states against any citizen because of his race.