Black people may have started Memorial Day. Whites erased it from history.

On May 1, 1865, thousands of newly freed Black people gathered in Charleston, S.C., for what may have been the nation’s first Memorial Day celebration. Attendees held a parade and put flowers on the graves of Union soldiers who had helped liberate them from slavery.

The event took place three weeks after the Civil War surrender of Confederate Gen. Robert E. Lee and two weeks after the assassination of President Abraham Lincoln. It was a remarkable moment in U.S. history — at the nexus of war and peace, destruction and reconstruction, servitude and emancipation.