Why did it take even more time to pass amendment 13 which was approved two years after the emancipation proclamation

The 13th Amendment to the U.S. Constitution officially abolished slavery in America, and was ratified on December 6, 1865, after the conclusion of the American Civil War. The amendment states: “Neither slavery nor involuntary servitude, except as a punishment for crime whereof the party shall have been duly convicted, shall exist within the United States, or any place subject to their jurisdiction.”

It took a long time because the 12th amendment was to get rid of slavery and white southern colonist thought it ruin their land