The June 19 holiday, Juneteenth, commemorates the end of slavery in the United States.

It is a holiday long celebrated by the Carver community.

Juneteenth -- a blending of the words June and nineteenth -- is the oldest regular US celebration of the end of slavery. It commemorates June 19, 1865: the day that Union Army Maj. Gen. Gordon Granger rode into Galveston, Texas, and told slaves of their emancipation.

Forty-seven states and the District of Columbia mark June 19 as a state holiday or observance. That day came more than two years after President Abraham Lincoln issued the Emancipation Proclamation on January 1, 1863. Even after Lincoln declared all enslaved people free on paper, that hadn't necessarily been the case in practice. African Americans and others mark Juneteenth -- also called Emancipation Day -- much like the Fourth of July, with parties, picnics and gatherings with family and friends.

President Donald Trump plans to resume holding his political rallies — in Tulsa on June 19. Yet Tulsa is the site of one of the worst episodes of racial violence in U.S. history: the Tulsa Race Massacre. A white mob attacked residents, homes and businesses in the predominantly black Greenwood neighborhood of Tulsa, Oklahoma. The event remains one of the worst incidents of racial violence in U.S. history, and one of the least-known: News reports were largely squelched, despite the fact that hundreds of people were killed and thousands left homeless.

Many people are calling on Trump to at least change the Juneteenth date of the Oklahoma rally kick-starting his return to public campaigning. Trump campaign officials discussed in advance the possible reaction to the Juneteenth date, but there are no plans as of this writing to change it despite fierce and widespread criticism.

JUNE 13 UPDATE: The president announced he would delay the campaign rally by a day. And there is this op-ed on June 15.