Well, here for example is the text of the South Carolina ordinance of secession. This ordinance states that South Carolina is seceding from the Union, that it is doing so to protect its rights upon which the federal government is (or, rather, threatened to) infringing, and that those rights were the right to hold slaves. Furthermore, the state was particularly annoyed at the northern states' attempts to subvert the Fugitive Slave Act. Read it for yourself.
Oddly enough there doesn't seem to be anything in there about "taxes" or "economic control", excepting taxes on slaves. Either the secession convention didn't consider these factors as important as slavery, or you're engaging in revisionist history.
Why did the North go to war? To preserve the Union, moron!
How peculiar! Most of the histories I've read have stated that the South began the war when the Confederate state governments tried to seize United States property and began shelling it. You must have access to the lost accounts of Fort Sumter firing on Charleston. Will wonders never cease.