Over the past few days we’ve seen what happens when you assign someone a single identity. Pollsters assumed that most Latinos would vote only as Latinos, and therefore against Donald Trump. But a surprising percentage voted for him.

Pollsters assumed women would vote primarily as women, and go for Hillary Clinton. But a surprising number voted against her. They assumed African-Americans would vote along straight Democratic lines, but a surprising number left the top line of the ballot blank.

The pollsters reduced complex individuals to a single identity, and are now embarrassed.

But pollsters are not the only people guilty of reductionist solitarism. This mode of thinking is one of the biggest problems facing this country today.

Trump spent the entire campaign reducing people to one identity and then generalizing. Muslims are only one thing, and they are dangerous. Mexicans are only one thing, and that is alien. When Trump talked about African-Americans he always talked about inner-city poverty, as if that was the sum total of the black experience in America.