We hear much loose talk these days about all the things that are supposed to unite us as Americans. But there are far more important and powerful forces that divide us.

At the center of that divide is the subject of class. Even more than race, the class divide lies at the base of the chasm that separates what John Edwards once called “two Americas.”

The symbols are everywhere: Starbucks America versus Dunkin’ Donuts America. Educated versus non-educated. Walmart versus Whole Foods. But these are just symbols for the manifestations of a long history of class conflict in America.

How they're playing out today is reflected in Sarah Smarsh's new memoir

Heartland: A Memoir of Working Hard and Being Broke in the Richest Country on Earth.

My conversation with Sarah Smarsh: