Here's the history of the Civil War they don't teach you in school and there are way too many people who are ignorant to what actually happened because they have only been exposed to the government's version of history (properly educated people are dangerous to governments and elite aristocrats). Slavery was not the primary reason the Civil war happened, but that economic clashes were the primary reason. Lincoln didn't care about freeing slaves (he was a white supremacist), he only cared about preserving the union in whatever way possible, even if it meant freeing the slaves (or NOT freeing the slaves).
The states wanted to secede because they found that importing textiles and other manufactured items from Europe were much cheaper than importing them from the northern states. So the Republicans in Congress decided to do away with the free market and levy a huge tariff on all European goods that were competing with big northern manufacturing businesses. Since there was no competition for northern businesses anymore, they just charged the southern states as much as they possibly could for textiles and manufactured items. Not only that, but European countries reacted to the tariff by stopping the purchase of southern cotton.
Both of these factors CRUSHED the southern economy, and on top of that, there was pressure from the north on the south to get rid of their slaves, which WAS their labor force at the time (and therefore what little economy they had left). They wanted to secede because the north was destroying them economically. It had little to do with the right to own slaves. It's a classic example of how Collectivist economies subvert the free market: they always enrich one group of people at the expense of another.
Nobody in the north cared about the Civil War because in the beginning it was only about business interests. So it was no surprise that the Union was badly losing the war at the beginning. Since people in the north hardly cared about fighting a war for rich white elite businessmen, the Union had to figure out how to 1) get people to care, and 2) convince them to pay for it. Of course you KNOW these minor inconveniences were solved by the simple expediency of violating the Constitution. Lincoln decided to convert the Civil War from being seen as a rich elitist white man's war into an anti-slavery crusade through some good old fashioned government propaganda called the EMANCIPATION PROCLAMATION. (People are more likely to support unnecessary wars if they think FREEDOM is at stake. History tends to repeat itself - are you catching on yet?) Congress was not consulted; Lincoln just took it upon himself to pass it. This psychological tool created a surge of enlistments in the Union military.
Eventually even the Emancipation Proclamation stopped getting soldiers to care enough to re-enlist and risk dying for slaves that didn't really affect their own well-being. So Lincoln compensated for this other minor inconvenience by shredding the Constitution again and instituting a MILITARY DRAFT. But don't be mistaken, if you were rich enough, you could avoid the draft by contributing a sum of money to the government, or by hiring someone to take your place. So in a CLASSIC government style, only POOR people were drafted and forced to die for the government. This outraged many people in the north and violent riots erupted in Ohio, Illinois, and NYC. Lincoln's Union Army was called in and killed and wounded over a thousand protesters just by firing randomly into the crowds in NYC. Nice.
Lincoln responded again by, you guessed it, taking a (*)(*)(*)(*) on the Constitution. He straight up PEACED habeas corpus, which allowed the government to imprison critics without due process of law or formal charges brought against them. So under the guise of slavery opposition, Americans were killed by their own government on their own streets, thrown into jail without due process, and the poor were forced to fight and die in a war they didn't support. Herein lies a classic example of Collectivist hypocrisy. Americans were enslaved so that the slaves could be freed. Nice. It was done for the greater good of the greater number, but it does not matter to Collectivists that the Individual's rights are violated. Violating individual rights also is not good for the greater number, and destroys both the individual and the greater number.
There was also the minor issue of funding the war. The government wasn't about to allow the Constitution to get in the way of this one either! So an income tax was established, directly violating the part of the Constitution that prohibited federal income taxes. On top of that, war bonds were sold. But even this wasn't enough revenue, and Congress knew that raising income taxes would be dangerous to an already angrily anti-war northern population. So they had two options: either terminate the war, or create money out of thin air to pay for it. Let's be honest here, which one do you think Lincoln and his Republican Congress picked?
So they violated the Constitution again by having the Treasury emit bills of credit called the Greenbacks, and declared them as legal tender for all private debts (the public were forced to use them as currency in private transactions but had to pay taxes in real money). Some BANKERS did not like being cut out of the money creating scam Lincoln and Congress were doing. This led to the NATIONAL BANK ACT which established many nationally chartered banks who could create money out of thin air and purchase government bonds...bonds which paid them interest. Interest on money they created. Interest on nothing. The Confederacy basically did the same thing except the Confederate people had it much worse. They saw price increases of 9,100% due to the devaluation of fiat Confederate currency which was obviously in hyperinflation. Taxpayers on both sides picked up the tab in the form of inflation/higher prices; their savings and purchasing power was destroyed while bankers profited and the wheels of the war machine kept turning. (History tends to repeat itself - are you catching on yet?)
If the Constitution had been obeyed in the first place, the Civil War probably would have never happened. The North wouldn't have economically destroyed the south. The South would have soon abandoned slavery anyway in favor of more economically efficient machines as the north had been using. The Union Army wouldn't have killed its own people. Americans wouldn't have had their wealth confiscated and transferred to bankers and government through inflation. The Union would have been preserved without war. (On a side note, the National Bank Act locked the nation into perpetual debt and also set the stage for a more efficient piece of legislation that would centralize those nationally chartered banks into one collective unit called the FEDERAL RESERVE SYSTEM.) In conclusion, Protectionism and Tariffs are the main reason the Civil War happened, not slavery.