Final answer:
The Emancipation Proclamation was crucial for the abolition of slavery as it turned the Civil War into a fight against enslavement, leading to the enlistment of black soldiers in the Union army and setting the stage for the Thirteenth Amendment, which legally abolished slavery.
Step-by-step explanation:
The Emancipation Proclamation played a pivotal role in setting the stage for the abolition of slavery in the United States. While it did not immediately free all enslaved people, it marked a transformation in the Union's war aims and served as a critical step towards slavery's eventual end. The Proclamation, issued by President Abraham Lincoln on January 1, 1863, declared that all persons held as slaves in the rebellious states were to be free. However, it primarily applied to areas not under Union control and did not affect slaves in border states or areas already occupied by Union troops.
The Proclamation provided the impetus for the enlistment of nearly 200,000 black soldiers into the Union army, significantly bolstering its ranks and aiding the Union victory. Moreover, President Lincoln's measure paved the way for the Thirteenth Amendment, which was passed by Congress in early 1865 and ratified in December of that year, legally ending slavery in the United States.