15. United States v. Nixon (1974)
In 1974, the Supreme Court unanimously ruled in United States v. Nixon that President Richard Nixon must comply with a subpoena to release White House tapes related to the Watergate scandal. This landmark decision affirmed that not even the president is above the law, reinforcing the principle of executive accountability and the system of checks and balances. The tapes revealed Nixon’s involvement in the cover-up, leading to his resignation. (oyez.org)
