Final answer:
The Battle of Antietam was significant for multiple reasons including being the bloodiest single day in American history, allowing Lincoln to issue the Emancipation Proclamation, and not resulting in foreign assistance from England for the Confederacy.
Step-by-step explanation:
The Battle of Antietam, which took place on September 17, 1862, during the American Civil War, is significant for several reasons. Firstly, it was the bloodiest single day in American history, with an estimated 23,000 casualties. Secondly, it was a turning point in the war as Abraham Lincoln used the Union's tactical victory to issue the Emancipation Proclamation, which declared the freedom of all slaves in Confederate territory. Lastly, the battle did not result in any foreign assistance from England for the Confederacy. Therefore, the significance of the Battle of Antietam does not include allowing Southern states to get foreign assistance from England.
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