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What's the state of the nation at the end of the Civil War in 1865 ? (Context)

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Answer:

General Lee's first incursion into Northern territory ended with heavy Union and Confederate losses along Antietam Creek near Sharpsburg, Maryland, on September 17, 1862, when more than 23,000 men were killed, wounded, or missing in action in this, the bloodiest one-day battle of the Civil War.

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