Answer:
The Birth of a nation was a film that depicted black men as super predators who were out to r*pe white women and as a result a danger to them. It's release led to a drastic increase in Ku Klux Klan membership and subsequent violence toward black men.
Step-by-step explanation:
The Birth of Nation didn't create the racist tropes about black men it used. It did heavily influence a generation of white men and encourage the spread of these tropes.