How about we put it this way.
The Rebellion was about slavery. The effort to continue the Union had many causes.
The North had deferred to the southern slavers on many matters. No tax on exports, delayed ban on slave trade, even giving their property partial representation in the Congress. Taxes collected in the North went to fortify southern ports, hiring southern slaves to do the work.
Then, after all that forbearance on the part of the more populous and wealthier northern states, the spoiled sons of southern slaver/rapists wanted to set their own terms for departure, seizing uplands where slavery was not popular, and drafting southern men to protect their interests.
Many people in the US, North and South were opposed to an attempt by European interests to separate the growing US into squabbling ministates. Many people in North and South were opposed to extention of the problems inherent to Slave based society to the territories.
No wonder that Tennessee provided 56 regiments to fight for the Union. No wonder that the US first Alabama regiment was among the most reliable troops that Sherman took through Georgia.
Liberty and Union, One and Inseparable.
even lincoln, the TYRANT, stated that the war was ONLY to "preserve the union".
FACT!
free dixie,sw