1. American Revolutionary War: On April 19, 1775, a group of American colonists fought against British soldiers in the Battle of Lexington and Concord. It is considered one of the first battles of the American Revolutionary War and marked the beginning of the liberation of the 13 colonies from British rule.

2. Assassination of Martin Luther King Jr: On April 19, 1968, an inmate in Attica Correctional Facility stabbed a guard as part of a broader uprising that included demands for improvements in living conditions. In response, Governor Nelson Rockefeller ordered an assault on the prison, resulting in the deaths of 29 prisoners and 10 hostages.

3. Waco Siege: On April 19, 1993, a 51-day siege of the Branch Davidian compound in Waco, Texas, ended in a violent confrontation between federal agents and the religious sect. The siege resulted in the deaths of 76 people, including leader David Koresh.

4. Oklahoma City Bombing: On April 19, 1995, Timothy McVeigh detonated a bomb outside the Alfred P. Murrah Federal Building in Oklahoma City, killing 168 people and injuring hundreds more. It remains the deadliest act of domestic terrorism in US history.

5. Inauguration of the Syracuse University: On April 19, 1871, Syracuse University was inaugurated in New York. The university has since become a leading institution for academic research, with notable alumni including former US Vice President Joe Biden and journalist Ted Koppel.