That would be news to Rhode Island and North Carolina. Since you apparently do not know how many states there were in 1788 I can't put much value on the rest of your "facts".
Once again James Madison is known as the "Father of the Constitution". Gouverneur Morris headed the committee designated to write the constitution. Most sources I found listed Madison as the primary author.
There were at least one huge difference between the north and south, slavery. To claim there was no "north" and "south" in the late 18th century is like claiming there were only 11 states in 1788, in other words wrong.