Final answer:
Opponents of the Thirteenth Amendment argued that it would make the war worse, but this is incorrect. The amendment actually supports the Emancipation Proclamation, which helped the Union cause.
Step-by-step explanation:
One argument made by those who opposed the amendment is that it would make the war worse. They argued that the amendment would cause more Southern states to secede from the Union and prolong the war.
However, this argument is incorrect.
The Thirteenth Amendment actually supports the Emancipation Proclamation, which helped the Union cause during the Civil War. The Emancipation Proclamation declared that all slaves in Confederate territory were to be set free, which weakened the South and bolstered the North's war effort.
Learn more about Opposition to the Thirteenth Amendment and its impact on the Civil War