That's a bit like saying "The invention of the car really just changed the structure of the horse and buggy."
Not exactly. I am arguing that the US existed before the Constitution was written, and that the Constitution did not create the US but reorganized power in the system.
Under your analogy If you are saying that the horse and buggy are the Articles of Confederation, and the US Constitution is the car. What I would be arguing is that transportation didn't begin with the car, because the horse and buggy came before the car. The creation of the car did not create transportation, it merely changed the way that people got around, and how efficiently that happened.