Answer:
the Proclamation of 1763
Step-by-step explanation:
The proclamation of 1763 was made to prevent colonial expansion westward beyond Appalachia. This essentially made it illegal for the colonists to acquire the resources on the territory beyond Appalachia and conducted a business with the natives who live there.
This proclamation created a conflict between the English government and the Colonists. A lot of colonists had economic interest on the forbidden territory, since its contain vast amount of agricultural land and potential mining sites.