Final answer:
The Proclamation of 1763 created a border at the Appalachian Mountains that limited westward colonial expansion, leading to tension between colonists and the British government.
Step-by-step explanation:
The temporary border created at the Appalachian Mountains that restricted the movement of the colonists was established by the Proclamation of 1763. This was done to prevent further conflict with Native American tribes and the costs of defending the frontier after the Seven Years' War.
Colonists, including land speculators and those who looked to the west for new opportunities, felt the new boundary as a form of tyranny, as they had expected to be able to settle in these territories after the British victory over the French. They disregarded the Proclamation and continued to move westward, which contributed to increased tension and resentment towards British policies, eventually playing a role in the rising desire for independence.