The Legal Theory Bookworm recommends A Companion to American Legal History (Blackwell Companions to American History), edited by Sally E. Hadden & Alfred L. Brophy. Here is a description:
A Companion to American Legal History presents a compilation of the most recent writings from leading scholars on American legal history from the colonial era through the late twentieth century.
- Presents up-to-date research describing the key debates in American legal history
- Reflects the current state of American legal history research and points readers in the direction of future research
- Represents an ideal companion for graduate and law students seeking an introduction to the field, the key questions, and future research ideas