April 3 - The Super Outbreak, the largest series of tornadoes in history, hits 13 states and one Canadian province. By the time the last of 148 tornadoes hit early the following morning, 315 died and over 5,000 were injured.
July 17- A bomb planted by Irish Republican Army terrorists explodes in the White Tower at the Tower of London, killing one person and injuring 41. Another bomb explodes outside a government building in South London.
July 27-30 - Watergate Scandal: The House of Representatives Judiciary Committee adopts three articles of impeachment charging President Richard M. Nixon with obstruction of justice, failure to uphold laws, and refusal to produce material subpoenaed by the committee. He announces he will resign the next day, the first president to do so.