What was one of the primary objectives of the Emancipation Proclamation? To prevent European countries from aiding the North
To prevent European countries from aiding the North

To end slavery in the Border States and the Confederacy
To end slavery in the Border States and the Confederacy

To end slavery in the Confederacy and weaken the Southern war efforts.
To end slavery in the Confederacy and weaken the Southern war efforts.

To end slavery in the Union and the Border States no links

To end slavery in the Confederacy and weaken the Southern war efforts.

Explanation:

President Lincoln issued the Emancipation Proclamation in 1863 and this freed all the enslaved people in the Confederacy. This was a very good move because it had multiple effects that weakened the war effort of the Confederacy.

Firstly it made the Civil War about ending slavery which dissuaded European powers from supporting the Confederacy as they had abolished slavery. It also led to tens of thousands of African Americans signing up for the Union Army because they knew that victory meant freedom for their race.