Answer: Northern states and Southern states.
Step-by-step explanation:
James Madison and 56 other delegates met in Philadelphia were they held constitutional convention in May 1787. They sought to amend the Articles of Confederation and I'm a bid ended up creating a new constitution.
11 years earlier, Madison helped in developing Virginia's constitution and that served as the foundation for debate in the development of the U.S. Constitution.
Madison put forward a strong argument for a strong central government that would unify the country. As the northern and southern state battled for economic advantage.