Why was the treaty of paris a threat to native american lands

The British tried to keep settlers off of the Indian Lands. They respected the land west of the Appalacians as the Native Americans land. After the Treaty of Paris the Revolutionary War ended between the USA and Britain the west was opened up. Great Britain abandoned the claims to the trans-Appalachian region. The Native American nations were left to take "care" of their neighbors.

The correct answer is a.f.c