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Answer:
During the American Civil War (1861–1865), the Union, also known as the North, referred to the United States of America, specifically to the national government of President Abraham Lincoln and the 20 free states and 5 border states that supported it. The Union was dedicated to the defeat and termination of the Confederate States of America, informally called "the Confederacy" or "the South".
The Union Army was a new formation comprising mostly state units, together with the fewer units from the regular U.S. Army.
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