Shelby County v. Holder is a landmark Supreme Court case from 2013 that invalidated key provisions of the Voting Rights Act of 1965, particularly the formula used to determine which jurisdictions were required to seek federal approval before making changes to their voting laws. The ruling significantly limited the federal government's ability to oversee and regulate voting practices in states with a history of discrimination, raising important questions about the balance of power between state and federal authority in protecting voting rights.