That´s exactly the point: it was meant as a constitution for a union of sovereign states. IT WAS MEANT! It is no longer, since nobody seriously says Florida, Michigan or Oregon were sovereign states. The powers of the states and the federal stage need to be reformed.
You got that right.
The US has had a change of government during the last decades, and the federal government has become a behemoth. Our federal system is dying, while both conservative and liberals applaud, because their end justify the means.
We are becoming as centralized as France, where everyone looks at Paris for answers to their problems. Our Founding Fathers must be rolling in their graves.