Many things throughout history have happened on June 19. Since the dems are pushing it I'm guessing can narrow the list down to riot related stuff.
1943 Race riot in Beaumont Texas
1969 State troopers ordered to Cairo Ill, to quell racial disturbances
1980 Battle between police and demonstrators in Capetown, 34 killed
There are more
https://www.onthisday.com/events/june/19
Honestly, I don't know there are articles from 2017 saying they already are. But then Trump says they will be. Does anyone actually know the answer to this question?
https://newspunch.com/dhs-antifa-terrorist-organization/
https://dailycaller.com/2017/07/07/antifa-listed-among-domestic-terrorism-group-by-new-jersey/
https://townhall.com/columnists/jackkerwick/2017/09/05/antifa-officially-an-antiamerican-terrorist-organization-n2377185
Precisely what I was questioning the other day with the coffin.