Slavery was not an issue.
The Southern states seceded because the Republicans passed a high tariff.
For the North the issue was perserving the empire (saving the Union).
Now comes defense attorney and former public prosecuter John Remington Graham. Was there a deeper underlying cause, an agenda unbeknown to the southern states and perhaps also to Lincoln? Graham puts forward an intriguing thesis that bankers spent a decade fomenting hatred between North and South in order to provoke a war that would greatly increase federal debt, which the banks could acquire and use as reserves to support the issuance of money and credit. Federal debt would become the reserve basis (like gold) for the expansion of the money supply. This power would give bankers control of the government.
Graham states his position: