Political disfranchisement ended with passage of the Voting Rights Act of 1965, which authorized the federal government to monitor voter registration practices and elections where populations were historically underrepresented, and to enforce constitutional voting rights. The challenge to voting rights has continued into the 21st century, as shown by numerous court cases in 2016 alone, though attempts to restrict voting rights for political advantage have not been confined to the Southern states. Another method of seeking political advantage through the voting system is the gerrymandering of electoral boundaries, as was the case of North Carolina, which in January 2018 was declared by a federal court to be unconstitutional. Such cases are expected to reach the Supreme Court.