War powers could only be used for war, and he really can not make it last forever, so Lincoln realized he needed a constitutional amendment to abolish slavery.
During his early political career, Abraham Lincoln asserted that he wasn't an abolitionist and that the United States Constitution shielded slavery where it already existed. He quickly supported congressional action that resulted in the 13th Amendment. As a result, Lincoln altered both the war's objectives and his own views on slavery in the United States. The 13th Amendment called for the immediate abolition of slavery in all states and territories, with no compensation paid to slave owners.
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