In the United States, although the official language is English, the regions that are dominated by Mexican American the use speak Spanish often compared to English.
In order for a nation to remain one, the people have to accept the diversity of cultures in the nation and appreciate each other's culture.
In order not to become self-absorbed, it is necessary to train the sense of cultural relativism in the society and make certain differentiations between the idea of cultural relativism and ethnocentrism.