You need to remember it's your heritage and ethnic/national identity you wish to preserve, and I think I should add, propagate. Because of this influx of immigrants your national identity is changing. In America our national identity is a melting pot, a term that was already in use by the 1780s. "What then is the American, this new man? That the American is one who leaving behind him all his ancient prejudices and manners, receives new ones from the new mode of life he has embraced, the government he obeys, and the new rank he holds. He becomes an American by being received in the broad lap of our great Alma Mater. Here individuals of all nations are melted into a new race of men, whose labors and posterity will one day cause great changes in the world." - J. Hector St. John de Crevecoeur, Letters from an American Farmer.