Northwest Ordinance
During the 1781-89 Ariticles of Confederation Period Several of the Northern states came {This Close} to going to war with each other, over a combimation of Tarrif and Land Claims disputes,
Fortually for the US a comprise was reached with the Passage of the Northwest Ordinance, [the main peice of lesigration the A of C gov't passed]
If it had come to war most of the other states would have been drawn in. l