Civil War Analysis

Abolitionism during the Civil War was far more than just executing the idea of slavery
Most Northerners recognized the existence of slavery in the South and how poorly the slaves were treated. Most Northerners favored the policy of compensated emancipation. After 1849, abolitionists rejected this and demanded slavery to immediately end everywhere. Thus, the practice of slavery was officially outlawed in the Unites States of America as of January 1, 1863 with the "Emancipation Proclamation" by President Abraham Lincoln.
Source: http://www.civil-war.ws/slavery/