The democrats changed the immigration laws under JFKLBJ so that they could replace the American voters, and it worked.
The Gangs of New York was not authentic at all but of course you thought it was history, and how you think it is relevant is puzzling.
You post from historical ignorance on immigration and voting.
Gangs of New York was simply a current, popular fictional reference to a historical truth.
Throughout US History, new groups were often seen as “the other”.
Happens all over the world.
Europe has their Polish Plumber, England has their Paki cab driver, and America has their Mexican Landscaper.