American economic history, especially industrial slavery, antebellum agricultural and business development, and internal trade on the western river system.

Southern Appalachian region, especially land tenure, labor and extractive industries.

American legal history, especially as (1) it affects business combination, economic development, land tenure, and extractive industries and as (2) part of the post-Civil War constitutional and legal development in the Border States.

Black migration and educational development in the post-Civil War era.

Post Civil-War Border States and Reconstruction South.

United States and early Porfirian Mexico.