Civil rights continued to be a major issue facing the Warren Court in the 1960s. In "Peterson v. Greenville" (1963), Warren wrote the Court's majority opinion, which struck down local ordinances that prohibited restaurants from serving black and white individuals in the same room. Later that decade, the Court upheld the constitutionality of the Civil Rights Act of 1964 in "Heart of Atlanta Motel, Inc. v. United States". The Court held that the Commerce Clause empowered the federal government to prohibit racial segregation in public accommodations like hotels. The ruling effectively overturned the 1883 "Civil Rights Cases" in which the Supreme Court had held that Congress could not regulate racial discrimination by private businesses. The Court upheld another landmark civil rights act, the Voting Rights Act of 1965, by holding that it was valid under the authority provided to Congress by the Fifteenth Amendment.