The United States Army in the American Civil War was mostly made up of regiments of infantry and cavalry and batteries of artillery. With the exception of a small number of units from the United States Regular Army, most were organized, armed and equipped by the individual states and taken into national service.
Of the nineteen free states, all but Kansas, California and Oregon sent one or more regiments to the Eastern Theater, although the majority of the men from Ohio to the west fought elsewhere.
Of the slave states that remained in the Union, Missouri and Kentucky sent no troops to the east. Maryland sent units to both sides. Delaware sent several thousand men to the Union army and was the only slave state that provided no organized units to the Confederacy.
West Virginia was part of Virginia until the war. But much of it was strongly pro-Union and broke away to become an independent state in 1863.
Select any state to the right to see information on its individual regiments and batteries.
*Only states whcih contributed to the Eastern Theater are shown in the table, but contributions of men and units shown in the table are for all theaters.