Each kingdom inside the Union had its own one-of-a-kind regimental flags in the time of the Civil War

https://cristianfdeo021.tearosediner.net/flags-of-honor-the-symbolism-behind-civil-war-colors-and-emblems

Each nation in the Union had its own designated regimental flags for the time of the Civil War, reflecting regional pleasure and particular histories tied to their participation in the conflict.