Looking over the election returns, I sense that Trump’s support comes disproportionately from those with low social connectedness. My first clues came from the Dutch. Heavily Dutch-American counties in northwest and central Iowa and western Michigan, around Grand Rapids, were Huckabee and Santorum territory in past years.

This year, unlike surrounding territory, they voted for Ted Cruz, with Trump a poor third. Dutch-Americans have dense networks of churches and civic groups — unusually high social connectedness.

I saw something similar in strong Huckabee/Santorum southern Missouri. Southeast Missouri voted heavily for Trump, but southwest Missouri for Cruz. Southeast Missouri has high rates of disability insurance, an indicator of low workforce participation and low social connectedness. Southwest Missouri, headquarters of the Assemblies of God, has dense networks of civically active churches.

Similarly, exit polls show Trump doing worse with evangelicals who attend church weekly than with those who don’t. This helps explain why Trump carried South Carolina and lost Oklahoma, where church attendance is higher.