[from wikipedia] Lincoln's decision to issue the Emancipation Proclamation angered both Peace Democrats ("Copperheads") and War Democrats, but energized most Republicans. By warning that free blacks would flood the North, Democrats made gains in the 1862 elections, but they did not gain control of Congress. The Republicans' counterargument that slavery was the mainstay of the enemy steadily gained support, with the Democrats crushed at the 1863 elections in Ohio when they tried to resurrect anti-black sentiment.
except the civil war had already started, and abolition was not the cause, it was merely a catalyst.
The Emancipation Proclamation is an executive order issued by United States President Abraham Lincoln on January 1, 1863, during the American Civil War using his war powers. It was not a law passed by Congress. It proclaimed the freedom of slaves in the ten states then in rebellion, thus applying to 3.1 million of the 4 million slaves in the U.S. at that time. The Proclamation immediately freed 50,000 slaves, with nearly all the rest (of the 3.1 million) freed as Union armies advanced. The Proclamation did not compensate the owners, did not itself outlaw slavery, and did not make the ex-slaves (called freedmen) citizens.
On September 22, 1862, Lincoln issued a preliminary proclamation that he would order the emancipation of all slaves in any state of the Confederate States of America that did not return to Union control by January 1, 1863. None returned, and the order, signed and issued January 1, 1863, took effect except in locations where the Union had already mostly regained control. The Proclamation made abolition a central goal of the war (in addition to reunion), outraged white Southerners who envisioned a race war, angered some Northern Democrats, energized anti-slavery forces, and weakened forces in Europe that wanted to intervene to help the Confederacy.
Slavery was made illegal everywhere in the U.S. by the Thirteenth Amendment, which took effect in December 1865.
Trying to argue that it was Democrats vs Republicans is retarded.
By the 1850s, slavery was still legal in the southern United States, but had been generally outlawed in the northern states, such as Illinois. Lincoln disapproved of slavery, and the spread of slavery to new U.S. territory in the west. He returned to politics to oppose the pro-slavery Kansas–Nebraska Act (1854); this law repealed the slavery-restricting Missouri Compromise (1820). Senior Senator Stephen A. Douglas of Illinois had incorporated popular sovereignty into the Act. Douglas' provision, which Lincoln opposed, specified settlers had the right to determine locally whether to allow slavery in new U.S. territory, rather than have such a decision restricted by the national Congress. Foner (2010) contrasts the abolitionists and anti-slavery Radical Republicans of the Northeast who saw slavery as a sin, with the conservative Republicans who thought it was bad because it hurt white people and blocked progress. Foner argues that Lincoln was a moderate in the middle, opposing slavery primarily because it violated the republicanism principles of the Founding Fathers, especially the equality of all men and democratic self-government as expressed in the Declaration of Independence.
In late 1854, Lincoln ran as a Whig for the U.S. Senate seat from Illinois. At that time, senators were elected by the state legislature. After leading in the first six rounds of voting in the Illinois assembly, his support began to dwindle, and Lincoln instructed his backers to vote for Lyman Trumbull, who defeated opponent Joel Aldrich Matteson. The Whigs had been irreparably split by the Kansas–Nebraska Act. Lincoln wrote, "I think I am a Whig, but others say there are no Whigs, and that I am an abolitionist, even though I do no more than oppose the extension of slavery." Drawing on remnants of the old Whig party, and on disenchanted Free Soil, Liberty, and Democratic party members, he was instrumental in forging the shape of the new Republican Party. At the 1856 Republican National Convention, Lincoln placed second in the contest to become the party's candidate for vice president.
So you and all your Republican buddies can shove that "we were the champions of abolition" argument up your asses. It wasn't an issue between political parties, it was a moral issue that many Democrats supported and many Republicans opposed.
Now I'm done talking about it, I've got a funeral to help plan and I don't have the time or the patience to argue US history. (which is a stupid statement in and of itself)