The demographics of the USA has changed rapidly in the last 30 years. From an 80% White majority in 1980, that has dropped to less than 66% White majority in 2018 - from 4 out of 5 to 2 out of 3.
[For discussion purposes, 'White' means a person of 100% European descent, except for Spain or Portugal. 'Non-White' means African, Hispanic, or Asian lineage]
From the chart below [H/T, National Geographic], in abour 25 years those ratios will be 1 to 1, after which non-Whites become the majority. What difference will that make?
Already, America's children reflect the new reality to come:
America's white population is also aging rapidly, more rapidly than any of the minorities.
The demographic change is already written, unless crackpot policies of mass deportations of minorities come to pass. Time to panic? It is already clear that White fear was the single biggest force that attracted Republican primary voters and then new general election voters to Donald Trump in 2016, and he capitalised with race-baiting and fear-mongering. e.g. Mexican rapists and Defensive walls.
But it need not be so. The two largest American states by population, California and Texas, are already "majority-minority" states, one Blue and one Red. Under George W Bush and Karl Rove, Republicans saw an opportunity to attract conservative Catholic Latinos into the party. In fact, at one point in American history, Hispanics (Spanish speakers) were considered "White". Many Texan Latinos are Republican-voting.
But racial posturing, such as Trump indulged in, drives people into race silos, and very few Latinos (from Latin American) or Hispanics, especially young ones, would consider the Republicans as a "natural" party for them. OTOH, Whites may also be driven into their racial silo, with a mutual hostility resulting. There is a risk of Democrats vs Republicans becoming the "Browns" (or "Off-Whites") versus the "Pure Whites" parties. The risk of violent division, on the scale of 20th or 19th century race riots, is obvious.
Other possibilities are the emergence of a Latino-Black-Asians party that could bargain with both Republicans or Democrats as a key swing-vote constituency. Asians are also a demographic of increasing importance, based almost totally in the cities, and therefore most likely to be Democrat.
Another demographic is the "mixed" category, with marriages across the old racial lines becoming more common. This is a good explanation for the generation gap on "politically correct speech". Young people are much more likely to encounter racial diversity and be ok with it than their elders.
While many such as Ezra Klein write of the dangers of the violence of some Trump supporters and more radical right and alt-right element, a majority of Americans think diversity is a good thing for the country. In fact, Americans are far more positive about diversity than any European country.
Noah Smith: "The real news here is that the American experiment - the idea that you can build a society that is both diverse and free - is actually working."
White threat in a browning America
How demographic change is fracturing our politics.
Neighborhoods Back Up Americans' Diversity Talk
Most people don't seem to have a problem living in racially mixed areas.
As Churchill said, "You can count on the American people to do the right thing, after they've tried everything else."