Answer:
The land north of the Ohio River, west of Pennsylvania, and east of the Mississippi River became part of the United States, as a result of the Patriot victory in the Revolutionary War. Americans called the territory Northwest. Although the British ceded the land to the United States, there were already Native Americans living there. Violence broke out in the Ohio country in the late 1780s as American settlers moved into areas promised by treaty to the Native Americans. The settlers were often illegal squatters, who were simply claiming land without any legal right to do so.