The Oklahoma City bombing occurred on April 19, 1995, when a truck bomb exploded outside the Alfred P. Murrah Federal Building, killing 168 people and becoming the deadliest act of domestic terrorism in U.S. history.

On April 19, 1969, the first-ever human-made object, the Soviet spacecraft Luna 10, successfully entered orbit around the Moon, paving the way for future lunar exploration.

The American Revolutionary War began on April 19, 1775, with the Battles of Lexington and Concord, marking the first military engagements between the colonies and British forces.