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Military conflict in the Civil War

AP.USH: KC‑5.3.I.A (KC), KC‑5.3.I.D (KC), Unit 5: Learning Objective I, WOR (Theme)


-Source: “Filling cartridges at the United States Arsenal at Watertown, Massachusetts,” Harper’s Weekly, Library of Congress 1861
The image most directly reflects which of the following developments during the 1860s?
Choose 1 answer: