a question to anyone who is in the position to answer:
is there any constitutional provision requiring that we have five regions? because if not, we could have Pennsylvania and New Jersey join the Northeast, with West Virginia, Maryland,Delaware, and the District of Columbia joining the Southeast,with the boundary between the two regions set roughly at the Mason-Dixon Line dividing North from South.
While the Constitution does not explicitly state that their must be 5 regions the wording is set up so that 5 regions is the normal and should be continued. Otherwise the number of Senators would change, the number of governors, who draw up the districts, would have to be changed, and certain provisions in the exchanging of states would have to be reworded.