See "..regulate interstate commerce..." and court decisions on same. And yes, actions taken completely in one state "can" impact interstate commerce, and is so held by Supreme Court decision.
We've already covered that subject. You're starting to repeat yourself.
“Interstate commerce crosses state lines and is within the federal government’s authority to regulate if it chooses. Intrastate commerce is conducted within a state’s borders - state law applies, unless a preemptive federal law applies”
Again, what business is it of yours what Indiana does with Indiana state taxes?