How were the the Appalachian mountains used by the English to contain settlement in America in 1763?

In 1763, the English government established the Proclamation Line of 1763, which restricted colonial expansion westward beyond the Appalachian Mountains. This was intended to stabilize relations with Native American tribes and prevent further conflicts after the French and Indian War. By designating the mountains as a boundary, the British aimed to control settlement and trade, ensuring that colonists remained on the eastern side while reserving the western lands for Indigenous peoples. This policy generated resentment among colonists eager for westward expansion and contributed to growing tensions leading up to the American Revolution.