While many Civil War reference books exist, there is no single compendium that contains important details about the combatant states (and territories) that Civil War researchers can readily access for their work. People looking for information about the organizations, activities, economies, demographics, and prominent personalities of Civil War States and state governments must assemble data from a variety of sources, with many key sources remaining unavailable online. This crucial reference book, the fifth in the States at War series, provides vital information on the organization, activities, economies, demographics, and prominent personalities of Ohio during the Civil War. Its principal sources include the Official Records, state adjutant-general reports, legislative journals, state and federal legislation, federal and state executive speeches and proclamations, and the general and special orders issued by the military authorities of both governments, North and South. Designed and organized for easy use by professional historians and amateurs, this book can be read in two ways: by individual state, with each chapter offering a stand-alone history of an individual state’s war years; or across states, comparing reactions to the same event or solutions to the same problems.