Trump's Tulsa rally and a massacre in 1921

President Trump held his first rally for three months, in Tulsa, Oklahoma on Saturday June 20th.

The White House says a million people applied for tickets. The head of the Health department in the city had asked the President to cancel the event, as did black leaders.

The big election rally had already been shifted back -- the original plan was to hold it on June 19th -- known in the States as "Juneteenth" – the day celebrating the end of slavery -- but that caused offence.

As Mark Mardell has been finding out, Tulsa is a city with a troubling history.

(Photo: Aftermath of the Tulsa Race riots in 1921
Credit: Getty Images)