President Trump has announced he will hold his first campaign rally since March 2 in Tulsa, Oklahoma, on June 19 — a highly symbolic day. It was on June 19, 1865, that enslaved Africans in Texas first learned they were free — two years after Abraham Lincoln signed the Emancipation Proclamation. The day is now celebrated as Juneteenth.

Tulsa recently marked the 99th anniversary of one of the deadliest mass killings of African Americans in U.S. history. In 1921, a white mob killed as many as 300 people, most of them Black, after a Black man was accused of assaulting a white elevator operator. The white mobs destroyed a thriving African American business district known at the time as the Black Wall Street of America.