You understand that the United States of America predates the Constitutional Convention, right? You also understand that the Articles of Confederation allowed for states representation to Congress right? Presumably you also understand the delegates are representatives of the people from those 13 states, right?
Nah, you don't understand jacksh6t imho.
Not our Republic. That was a Confederation of states.
Yes, states predated the United States of America. The states were the source of the powers delegated to the federal government by the Constitution.