Why did the Proclamation of 1763 anger American colonists?

The Proclamation of 1763 was issued by the British government following the conclusion of the French and Indian War. Its primary purpose was to stabilize relations between Native Americans and colonial settlers by establishing a boundary line along the Appalachian Mountains, effectively prohibiting colonial expansion into the territories west of this line.

This angered American colonists for several reasons. Many had already migrated westward and had established settlements in these new territories. The Proclamation not only prevented further movement into areas that were perceived as available for settlement but also invalidated the land claims of those who had moved into those regions. This restriction was seen as a limitation on their freedom and growth potential, creating frustration and resentment among colonists who believed they had the right to settle on these lands after fighting for Britain during the war.

In this context, the correct answer highlights the specific action taken by the Proclamation that directly affected colonial ambitions and settler rights, thereby fueling feelings of opposition among the colonies towards British rule.