Minor points, the events of the Civil War and it’s ending led to ratification of the 13th amendment which led to slavery’s end in all states....even it was 6 months after the war. Lincoln of course wasn’t around to see the amendment ratified by the Union as he had been assassinated.
That's not the reason why Lincoln did what he did. He didn't apply the proclamation to states that weren't in a state of rebellion because he couldn't apply it to states that weren't in a state of rebellion.
Lincoln correctly knew that it would take an amendment to the constitution in order to end slavery nationally.
Oh, and BTW - Lincoln never didn't have legal control over every state - he only (temporarily) lost effective control due to the insurrection.
Missouri, West Virginia, and Maryland had ended slavery on their own before the end of the rebellion. When the 13th Amendment was ratified only Kentucky and Delaware has slaves left to free.
The Federalists destroyed the anti federalists in the civil war...25 years later we had our first billion dollar budget..150 years later we are looking at a 4 trillion dollar budget and 21 trillion dollars worth of debt. The southern states detested the power of the federal government. Many southern states refused to meet with Jefferson Davis because they feared he was turning the confederacy into the pre war USA. One fifth of the population of Georgia did not die just to preserve slavery.
The Thirteenth Amendment, which outlawed slavery, was passed because of the Civil War.
So, sure, the war ended slavery. Indirectly, if you like, but inevitably.
Because Lincoln didn't want to push the border states into supporting the Confederacy, his Emancipation Proclamation specifically DID NOT free any slaves in the states he legally had control over. He only 'freed' the ones in states that were no longer part of his Union.
Because Lincoln didn't "have control" over those Border States. They had their own loyal state governments that he couldn't override.
As commander-in-chief, Lincoln could, as a war measure, declare the slaves of those fighting the US to be free.
One precedent for that was the freeing of the slaves of the Seminole Indians during the Second Seminole War.