Anyone who knows anything about New York city knows that it is ethnically segregated.
If New York city is our best model of a melting pot for the rest of our country to emulate, we may as well divide the states up now along ethnic and religious grounds and start relocating folks of different ethnicity and/or religion.
The notion of a melting pot is left-wing propaganda. There is no evidence that ethnic and religious differences will disappear in this age of the world.