Answer: Mississippi River and the Appalachian Mountains.
Step-by-step explanation:
The Treaty of Paris was signed on September 3, 1783 between the Kingdom of Great Britain and the United States of America, ending the United States War of Independence. This was done because the war reached a point in which both sides were exhausted, many lives had been lost and a military solution was no longer viable.
It should be noted that for the signing of this document, the representative of King George III of Great Britain was the member of the British Parliament David Hartley, while the representatives of the United States were John Adams, Benjamin Franklin and John Jay.
However, the most notorious aspect of the Treaty of Paris is that Britain recognized the independence of the Thirteen Colonies as the United States of America, recognizing it as a nation, and granted it the entire territory to northern Florida, to southern Canada (including the Appalachians) and east of the Mississippi River (giving up most of its territory east of this river), which meant the expansion of the United States.
In addition, the British crown gave the entire area of the Northwest Territory (including the current states of Ohio, Michigan, Indiana, Illinois, Wisconsin and parts of Minnesota), opening the way for the future expansion of the United States to the West.