if you read the original Confederate constitution, it said "to preserve slavery" so that IS why they fought the war.
They seceded to preserve slavery in their own state. They fought a war because Lincoln assembled a 75,000 man army to force them to remain part of the Union. A look at where the battlefields are should give you an indication of who invaded whom.
“if you read the original Confederate constitution, it said “to preserve slavery” so that IS why they fought the war.”
If you read the original United States constitution, it enshrined slavery. President Lincoln twice took an oath to uphold the pro-slavery U.S. constitution.
Did you know the Union forces, ostensibly, were fighting to preserve the pro-slavery U.S. constitution? (Arguably, Union forces were fighting to overthrow the pro-slavery U.S. constitution.)
But, after the Emancipation Proclamation, President Lincoln actually did add another slave state to the Union.
Look it up.
Preserving slavery was not an issue. In 1861, Representative Thomas Corwin of Ohio (a Yankee) proposed the Corwin Amendment which was a Constitutional Amendment that would enshrine slavery where it was being practiced (primarily the South). This amendment passed the House and the Senate but guess what? None of the representatives or Senators from the South voted for it. The North was trying to remove forever the issue of ending slavery in a bid to "preserve the union" so they could continue to financially rape the South.
The South had enough and was fed up that politically, no new slave states were going to be allowed which would continually weaken their ability to defend themselves from the North's imposing their will on them. The North had a sweet deal going for itself and did not want the gravy train to end. The South fought the war against their will and against their best interest as without some sort of foreign assistance, the deck was stacked against them winning in the long run. The North FORCED them to fight the war because the South had to defend themselves and their homes and families. Slavery isn't the cause. The Greed of the North was.
You would do well to study the financial impact that the Southern economy had on the North to see just how much wealth was being stolen from the South. The North made forty cents on the dollar from the profits of the South yet the South is who did all of the work and bore the responsibility for maintaining their large work forces. The North was not as pure as some history books would have you presume.
Slavery was codified in the US Constitution. The Confederate States just adopted the US Constitution with some additions.