Today, an American’s economic status is a bad predictor of his or her voting preferences. His or her views on social issues—say, same-sex marriage—are a much more accurate guide to whether he or she will support Republicans or Democrats.

That slower growth is coupled with challenges that relate to the new global economy. Globalization is now pervasive and entrenched, and the markets of the West are (broadly speaking) the most open in the world. Goods can easily be manufactured in lower-wage economies and shipped to advanced industrial ones. While the effect of increased global trade is positive for economies as a whole, specific sectors get battered, and large swaths of unskilled and semiskilled workers find themselves unemployed or underemployed.

The most widely held job for an American male today is driving a car, bus, or truck, as The Atlantic’s Derek Thompson has noted.

This convergence in economic policy has contributed to a situation in which the crucial difference between the left and the right today is cultural.

The shift began, as Inglehart and Norris note, in the 1970s, when young people embraced a postmaterialist politics centered on self-expression and issues related to gender, race, and the environment. They challenged authority and established institutions and norms, and they were largely successful in introducing new ideas and recasting politics and society. But they also produced a counterreaction. The older generation, particularly men, was traumatized by what it saw as an assault on the civilization and values it cherished and had grown up with. These people began to vote for parties and candidates that they believed would, above all, hold at bay these forces of cultural and social change.

The most striking findings of the paper are about the decline of economics as the pivot of politics.

Voting patterns traditionally reinforced this ideological divide, with the working class opting for the left and middle and upper classes for the right. Income was usually the best predictor of a person’s political choices.

There is a reality behind the rhetoric, for we are indeed living in an age of mass migration. The world has been transformed by the globalization of goods, services, and information, all of which have produced their share of pain and rejection. But we are now witnessing the globalization of people, and public reaction to that is stronger, more visceral, and more emotional.

For the vast majority of human history, people lived, traveled, worked, and died within a few miles of their birthplace. In recent decades, however, Western societies have seen large influxes of people from different lands and alien cultures.

. The number of immigrants entering many European countries is historically high. In the United States, the proportion of Americans who were foreign-born increased from less than five percent in 1970 to almost 14 percent today. And the problem of illegal immigration to the United States remains real, even though it has slowed recently. In many countries, the systems designed to manage immigration and provide services for integrating immigrants have broken down. And yet all too often, governments have refused to fix them, whether because powerful economic interests benefit from cheap labor or because officials fear appearing uncaring or xenophobic.

Trump’s political genius was to realize that many Republican voters were unmoved by the standard party gospel of free trade, low taxes, deregulation, and entitlement reform but would respond well to a different appeal based on cultural fears and nationalist sentiment.