Today's American society is divided along class lines that are sometimes subtle and sometimes stark. Studying these divides involves examining subjects like income inequality, the changing economy, and the complex interactions between class and education, race, and health care. This series looks at the history of these issues, where they stand today, and how they might manifest tomorrow. Aligned to Common Core Standards and correlated to state standards. Essential Library is an imprint of Abdo Publishing, a division of ABDO.