You will find few more supportive of the Union anywhere. States' Rights was a code word for racist oppression. In fact, you can find threads with hundreds of posts by me fighting the States' Righters over the powers left to states.
Recognizing that the Constitution deliniated separate spheres of power for the fedgov and the states in no way implies that this means you are a States' Righter.
Our Constitution is SUPREME over all conflicting laws but that does not mean that it overrides ALL state powers within the sphere of influence left to states by the document itself.
Nor was Barron vs Baltimore decided on the basis of States' Rights but rather what the Bill of Rights was intended to apply to.
Then you agree that the 2nd needs no 'interpretation', as it "flat out" says the peoples right to keep and bear arms shall not be infringed?
-- Article VI, -- as well as both the 10th & 14th Amendments, -- make it clear that means no infringements by any level of gov't in the USA.