The United States has never had to assimilate large numbers of the most backward people in the 21st century.I would love to see you attempt to explain how an already fragmented country will survive influxes of radical Muslims and Chicano supremacists..
The same way the United States has survived every wave of immigrants.
Despite what racists and bigots like you have said about every wave of immigrants.
Bigots and racists have been saying the same crap for 200 years.
Read up on what people like you called the Irish and the Italians.