From Victor Davis Hanson:
Sometime in the late 20th century, America largely gave up on multiracialism under one common culture and opted instead for multiculturalism, in which each particular ethnic group retained its tribal chauvinism and saw itself as separate from the whole.
Hyphenated names suddenly became popular. The government tracked Americans’ often complicated ethnic lineage. Jobs and college admissions were sometimes predicated on racial pedigrees and quotas. Courts ruled that present discrimination was allowable compensation for past discrimination.
Schools began to teach that difference and diversity were preferable to sameness and unity. Edgar Allan Poe and Langston Hughes were categorized as “white male” or “black” rather than as “American” authors.
Past discrimination and injustice may explain the current backlash against melting-pot unity. And America’s exalted idealism has made it criticized as less than good when it was not always perfect.
Nonetheless, for those who see America becoming a multicultural state of unassimilated tribes and competing racial groups, history will not be kind. The history of state multiculturalism is one of discord, violence, chaos and implosion. More.
Reality check: Most cultures, worldwide, have been ragged and starving, nursing their grievances, unable to rise, due to narrow interests. Just think; we chose this over prosperity.
See also: Ferguson effect harms African Americans Hint: Personal safety always pays. Progressive correctness, maybe not.