[Bull Snipe]

“In 1865 Six months after slavery had already been abolished in the Confederacy”
Your statement is inaccurate. Slavery still legally existed in almost the entire state of Tennessee. 13 Parishes in Louisiana, the Tidewater region of Virginia, parts of coastal North Carolina, South Carolina and Georgia.
These areas were exempt from the Emancipation Proclaimation because they were under Federal control on January 1 1863. Those slaves and the slaves in Kentucky, West Virginia and Delaware would not be freed until the XVIII amendment to the Constitution was ratified.

[DiogenesLamp]

I am aware that areas under Union control were exempted. Sometimes brevity is more beneficial than absolute accuracy.

The point I am making is that Union slavery continued while "rebel" slavery stopped.

Slavery was therefore not the crux of the Union's goal. Submission was.