Events
- 1846 – Mexican–American War: Mexico declares war on the United States.
- 1863 – Organization of the Seventh-day Adventist Church in Battle Creek, Michigan.
- 1900 – American Civil War: Sergeant William Harvey Carney becomes the first African American to be awarded the Medal of Honor, for his heroism in the Assault on the Battery Wagner.
- 1911 – Dedication ceremony for the New York Public Library.
- 1929 – The first talking cartoon of Mickey Mouse, The Karnival Kid, was released.
- 1933 – Seabiscuit, legendary American racehorse, is born.
- 1934 – American bank robbers Bonnie and Clyde were ambushed by police and killed in Black Lake, Louisiana.
- 1934 – The Auto-Lite strike culminated in the "Battle of Toledo", a five-day melee between 1,300 troops of the Ohio National Guard and 6,000 picketers.
- 1939 – The U.S. Navy submarine USS Squalus sinks off the coast of New Hampshire during a test dive, causing the death of 26 sailors. The remaining 32 crewmen and one passenger are rescued the following day.
- 1958 – Explorer 1 ceases transmission.
- 1985 – U.S. engineer Thomas Patrick Cavanagh is sentenced to life in prison for attempting to sell stealth bomber secrets to the Soviet Union.
- 1995 – Oklahoma City bombing: In Oklahoma City, what remains of the Alfred P. Murrah Federal Building is imploded.