And what issue was most prominent in the southern rebellion? Slavery.
Which wars have not been fought over economics?
There have been many, depending on who you listen to. But economics played a big part in the southern rebellion as well. The southern economy was dependent on plantation agriculture. It was the be all and end all of their prosperity. And plantation agriculture was totally dependent on slave labor.
Why did the South depend on slave labor? Because they couldn't get a decent price for their goods without shelling out to the North (who depended on slave labor, too!)? Because profit margins were so low that they had to have huge operations or run at subsistance levels? Like farming today, large operations have grown of the need to make money on volume, rather than just profit margin. The more efficient operations end up absorbing the remnants of the less efficient ones. You end up with 10,000 acre wheat farms that way, only now, you would buy mechanical devices to do the work. Ultimately, this is cheaper to operate, you only have to feed them when they are working.
Manumission was gaining ground in the South, it is far cheaper to hire someone and let them fend for themselves than to be the owner and have to provide housing, clothing, food, medical care, etc.
Harriet Beecher Stowe wrote a NOVEL! Just because it has been made into a Yankee Mein Kampf by historical revisionists seeking to banish the culture that, by and large wrote the Constitution, Bill of Rights, and The Declaration of Independance, does not make it true, or a balanced assesment of the issues of the day.