For several years, the matter of states rights were argued
in the legislature before the war started. Military installations in the South were set up to enforce the collection of tariffs. There were other issues involved in states rights than slavery.
Military installations were set up to defend the south from foreign countries. Tarriffs were collected at particular locations separate from the military installations.
That wasn’t just in the south. Tarriffs were also collected in the northern states that imported goods (a counter example: no tarriffs were collected in Kentucky or Arkansas as they had no ports for international trade!). More tarriffs were collected in the north than in the south.
Do you have any documentation on that?