President Lilcoln was a key factor in making slavery largely ended during the civil war before the passage of the 13th amendment.
Before the American Civil War, Abraham Lincoln and other leaders of the anti-slavery Republican Party sought not to abolish slavery but merely to stop its extension into new territories and states in the American West. This policy was unacceptable to most Southern politicians, who believed that the growth of free states would turn the U.S. power structure irrevocably against them. In November 1860, Lincoln’s election as president signaled the secession of seven Southern states and the formation of the Confederate States of America. Shortly after his inauguration in 1861, the Civil War began. Four more Southern states joined the Confederacy, while four border slave states in the upper South remained in the Union.
B) Us Congress was divided at that time because there were congressmen in favor of slavery and other were in favor of freedom for slaves.
Enslaved African Americans didn't have political power.
C) By the end of the Civil War, roughly 179,000 black men (10% of the Union Army) served as soldiers in the U.S. Army and another 19,000 served in the Navy. Nearly 40,000 black soldiers died over the course of the war—30,000 of infection or disease.