What did President Lincoln support the abolition of slavery?

President Lincoln supported the abolition of slavery primarily because he believed it was morally wrong and a violation of human rights. He viewed the preservation of the Union as essential and recognized that ending slavery would help achieve that goal, particularly during the Civil War. Additionally, Lincoln's Emancipation Proclamation in 1863 aimed to weaken the Confederacy and shift the war's focus towards human freedom, ultimately leading to the passage of the 13th Amendment, which abolished slavery in the United States.