Associated Press

On April 19, 1775, the American Revolutionary War began with the battles of Lexington and Concord.

In 1897, the first Boston Marathon was held; winner John J. McDermott ran the course in two hours, 55 minutes and 10 seconds.

In 1993, the 51-day siege at the Branch Davidian compound near Waco, Texas, ended as fire destroyed the structure; about 80 people, including two dozen children and sect leader David Koresh, were killed.

In 1995, a truck bomb destroyed the Alfred P. Murrah Federal Building in Oklahoma City, killing 168 people.

In 2015, Freddie Gray, a 25-year-old Black man, died a week after suffering a spinal cord injury in the back of a Baltimore police van while he was handcuffed and shackled. (Six police officers were charged; three were acquitted.)