Following the passage of a five-year extension of the Voting Rights Act of 1965, the U.S. government files suits against the states of Arizona and Idaho to seek compliance with the law. Texas and Oregon file lawsuits claiming Congress has overstepped its authority when it passed the law. In the U.S. Supreme Court, the four cases are combined into one, Oregon v. Mitchell. The Court upholds the federal prohibitions on literacy tests and residency requirements and certain rules on absentee balloting. The Court also rules that Congress can lower the voting age in federal elections, but not in state and local elections.