Donald Trump could transform the Republican Party into a coalition focused on white identity politics. We've seen this in Europe, and it's bad. Now that we have had time to observe the Donald Trump phenomenon, there is enough evidence to make a clear assessment of what it represents. The rise of Trump is an epic expression of frustration with the American political system, and it is a natural outgrowth of frustrations with America’s changing demographics; the hollowing out of white working class values and culture, as Charles Murray has documented extensively; and what life is like when governed by...