Half Slave and Half Free is a powerful treatment of the basic issues and social transformations that precipitated the Civil War. In a succinct, persuasive narrative, Bruce Levine succeeds in showing how a popular basis for the Civil War developed out of the far-reaching and divisive changes in American life after the incomplete Revolution of 1776--changes that stemmed from the development of two very distinct social systems, one based on slavery, the other on free labor, which eventually made sectional differences within the framework of the Union irreconcilable.