Just because you disagree with the limits on federal power that is contained within the federal constitution does not mean that there is a debate on the Founding Fathers intent regarding the federal constitution.
The intent of the federal constitution is readily available, and clearly articulated, if you care to read what the Founding Fathers wrote down about the federal constitution before, during, and after its formation and ratification.
While I agree with your 'the state is not accountable to me' contention from a philosophical perspective, your proximity to your elected state officials makes the task of holding your state accountable to you far more easily attainable. ManInBlack makes the point clearly and correctly, proximity and the limited number of 'votes' forces your state reps to be more engaging, more responsive, if they desire to keep their job.
Just a few votes, less than 10, can keep an incumbent state rep employed, or packing up his stuff in a cardboard box. It happens. Can you, if you get involved, influence 10 citizens with respect to who they will vote for? I can, at least I'd like to think that I could influence far more than 10 citizens. It has happened before.
It is very easy to knock on your state reps office door than it is to travel to your congress persons office door. You likely will not even get into our nation's Capital building without a strip search. And as soon as 'they' do a little bit of investigating regarding you, they will determine that you are a gun nut, despite of your statist views, and you will likely be denied entry/access to your federal rep. There is always a 'town-hall' you could attend though.
Where as your state's capital building, and its inhabitants will be far less insulated from you. Here in Missouri, I can walk into the state capital building, right to my reps office, open the door and start getting 'engaged' in the issues that interest me. US Capital, not likely to happen.
I would not hold up the Federal Aid Highway Act of 1956 as a shinning beacon of a modern road system. Because, the system is in need of a great deal of repair (just to maintain it in its current and outdated design state), redesign and updating. I-70 between St. Louis and Kansas City Missouri is a prime example of a outdated and decaying interstate highway.
Though, it is by and far more modern and much preferable to any other system in any other country. Our interstate highway system design is being used in China. And likely for the same reasons we have a interstate highway system here.