When Simon graduated college, they were the class of 1918. When the 4th part began, the black men were killed and it was dated 1917.
On a side note, I don't care if this is true or not. This happened, happened more violent then what was shown, so who cares if some of it is factual and some isn't. Be happy the stories get out
Don't waste your time with explanations,
people only hear what they want.