How did Lincoln’s contributions during the Civil War affect the nation’s history

The Emancipation Proclamation, issued by Abraham Lincoln on January 1, 1863, freed all slaves in areas still in rebellion against the federal government. Delivered soon after the Union victory at the battle of Antietam, it motivated the Northern war effort and gave the war a higher purpose.

answer; i believe that the correct answer is (tobacco);

to protest slavery i would think it would be a