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The speech took place after the Battle of Antietam, when Lincoln declared slaves to be freed.
On this day in 1863, President Abraham Lincoln gave his famous Emancipation Proclamation speech.
The Declaration • September 22, 2016 • https://thedeclarationatcoloniahigh.com/18048/today-in-history/president-lincoln-gives-emancipation-proclamation-speech/
President Lincoln gives Emancipation Proclamation Speech