Beginning in 1964, U.S. laws have protected some, but not all, pregnant workers. Title VII of the Civil Rights Act prohibits employers with 15 or more employees from discriminating on the basis of sex, as well as race, color, national origin and religion. Until 1976 lower courts had held that Title VII applied to pregnancy. That year, however, the Supreme Court approved an employer's disability plan that covered all disabilities except pregnancy. The court reasoned that discrimination because of pregnancy was not discrimination because of sex.