History
The Division was constituted in 1921 and assigned to the First Army. Not all authorized units were active during the Division's lifetime. The Division did not participate in the First Army maneuvers in 1935, 1939, and 1940. The 21st was inactivated on 1 October 1940 and disbanded on 1 November 1940.
Read more about this topic: 21st Cavalry Division (United States)
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