How did the English hope the Proclamation Line of 1763 would enforce mercantilism?

The English hoped the Proclamation Line of 1763 would enforce mercantilism by limiting westward expansion of the American colonists, thereby preventing conflicts with Native Americans and ensuring that colonial trade remained concentrated within established borders. By controlling westward settlement, the British aimed to retain economic benefits from trade with indigenous peoples and manage resources effectively within the colonies. This regulation would help maintain a steady flow of raw materials to England while ensuring that colonial markets relied on British goods, reinforcing the mercantilist framework.