Final answer:
Lincoln originally saw the Civil War as a conflict to preserve the Union but later shifted to include emancipation as a war aim, culminating in the Emancipation Proclamation to free slaves in the Southern states.
Step-by-step explanation:
At the beginning of the Civil War, Abraham Lincoln viewed it as a war about the Union. As the war progressed, he changed his mind. In 1862, he announced he would issue the Emancipation Proclamation, which would free all enslaved people in the Southern states.