The main aim of the Northwest Ordinance of 1787 was to stipulate how new states would be created.
Well it depends what they are in need of. They most commonly would want more land for their country to build and farm on. They may want land with fertile soil for farming. They may want the land because of it's geography, for example, for simple trade routes leading to and from the areas around north America (Canada, Mexico) etc.
I think its A simple existence