But the religious views of immigrants, many of whom Kaufmann says will come from devout regions of the world, could push the U.S. to the right.

“As the secular regions age and depopulate, they will replenish their workforce with religious immigrants, injecting religion back into society and politics,” Kaufmann wrote.

Republicans could also offset Democrats’ gains through immigration if fertility among conservatives continued to outstrip that of liberals. Family size, which was once a matter of survival, is now a value choice.