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Republican Senator Charles Sumner of Massachusetts was a leading abolitionist in Congress. In this letter to the president, Sumner expressed his view that slavery was the main cause of the Civil War and that emancipation, once declared, could not be revoked. He urged President Lincoln to take a strong stand in dealing with the leaders of the rebellion.
Excerpt:
I have replied . . . that freedom once given could not be reclaimed, & that the country was solemnly bound to the immediate present freedom of every slave in the rebel states.
Manuscript Division, Letter of Congress