In theory, America is the land of opportunity: anyone can do anything, and we are not a country of strong class lines. That's the theory.
The recent debates about inequality remind us that people who don't make much money have a hard time getting to a position to make more.
Historian and author Nancy Isenberg says it's not a new situation. She is the author of the newly released White Trash.
The book tracks the accomplishments and abuses of (and on) poor white people since colonial days.
The author visits with highlights of her research.