Between Barack Obama’s 2008 election and 2016, America has transformed from being a majority white Christian nation (54 percent) to a minority white Christian nation (43 percent).

But on Election Day, paradoxically, this anxious minority swarmed to the polls to elect as president the candidate who promised to “make America great again” and warned that he was its “last chance” to turn back the tide of cultural and economic change.

One clue to the power of this racial and religious identity can be seen in the striking similarity of a map of white Christian population density by state to the red and blue election night map. While the similarity of those maps in Kentucky and West Virginia might not be a surprise, the same similarity in Wisconsin, Michigan and Pennsylvania goes a long way to explaining why Hillary Clinton’s Midwestern firewall did not hold on election night.

The choice before the country was starkly clear. Donald J. Trump’s Republican Party looked back wistfully to a monochromatic vision of 1950s America, while the major party fronting the first female presidential candidate celebrated the pluralistic future of 2050, when the Census Bureau first projected the United States would become a majority nonwhite nation.