Why did King George III feel that the Proclamation Line of 1763 was necessary? AKS 33a

Question

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5 points
Colonial expansion increased the risk of war with the American Indians in the territory west of the Appalachian Mountains.
Expansion of the colonies was necessary to pay down the national debt from the Seven Years War
It ensured that the French were not able to retake the territory England gained in the French and Indian War.
The colonists who fought in the French and Indian War were promised lands west of the Appalachian Mountains in return for their service in the war.

Answer 1

Colonial expansion increased the risk of war with the American Indians in the territory west of the Appalachian Mountains.