There was a time when periods of immigration were followed by moratoriums on immigration, to give the new arrivals time to assimilate. The influx has been too great for the melting pot effect. There are sections of this country where English is no longer even spoken. The country is being Bulkanized.
And that was when we received immigrants from a myriad of different cultures. We are taking in one culture, one country. You bet it's going to lead to the Balkanization.