Melting Pot vs. Patchwork Quilt
The term patchwork quilt refers to immigrants from multiple countries entering a new country, self-segregating into enclaves comprised only of members of their former nationality, and operating separately as opposed to assimilating and becoming a part of the new country that they live in.
Lack of assimilation is damaging and potentially dangerous for a country. A country whose citizens do not develop and maintain a common language, culture, mores, law, patriotism, and loyalty to that country will be divided, weaker, and vulnerable. There is of course nothing wrong with citizens speaking additional languages and valuing their heritage. It is difficult for a nation that is divided to function. It is more difficult for build and expand a business or to socialize if citizens cannot communicate with each other.
It is critical for the prosperity and stability of a nation, and a mutual responsibility, for new and current citizens to reach out to one another in order to foster assimilation and a common nationality.