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 from the map or the menu to see information on its regiments and batteries.
Contributions of men and units by each state to the Union army*:
|Connecticut||53,721 men||33 regiments and 3 batteries|
|Delaware||12,280 men||10 regiments and 2 batteries|
|District of Columbia||15,181 men||3 regiments|
|Illinois||256,868 men||173 regiments and 35 batteries|
|Indiana||195,285 men||167 regiments and 26 batteries|
|Iowa||75,797 men||64 regiments|
|Maine||65,077 men||36 regiments and 7 batteries|
|Maryland||42,713 men||24 regiments and 6 batteries|
|Massachusetts||125,747 men||80 regiments and 48 batteries|
|Michigan||86,866 men||79 regiments and 14 batteries|
|Minnesota||24,017 men||14 regiments and 3 batteries|
|New Hampshire||33,055 men||21 regiments and 1 battery|
|New Jersey||68,685 men||44 regiments and 5 batteries|
|New York||413,686 men||316 regiments and 77 batteries|
|Ohio||309,906 men||249 regiments and 42 batteries|
|Pennsylvania||323,629 men||291 regiments and 35 batteries|
|Rhode Island||21,358 men||18 regiments and 10 batteries|
|Vermont||32,669 men||20 regiments and 3 batteries|
|West Virginia||32,068 men||27 regiments and 8 batteries|
|Wisconsin||91,194 men||59 regiments and 13 batteries|
|United States Regular Army||16 regiments and 60 batteries|
|United States Colored Troops||175 regiments|
|United States Veteran Infantry||9 regiments|
*Only states that contributed to the Eastern Theater are shown in the table, but contributions of men and units shown in the table are for all theaters.