What decree did King George III issue forbidding settlement west of the Allegheny Mountains?

The Proclamation of 1763 was issued by King George III primarily to stabilize relations with Native American tribes after the French and Indian War. By forbidding colonial settlement west of the Allegheny Mountains, it aimed to prevent further conflicts between colonists and Native Americans over land. This decree recognized the territories reserved for Indigenous peoples and established a boundary line that colonists were not permitted to cross.

This decision reflected the British government's desire to manage colonial expansion and maintain peaceful relations with Native Americans, demonstrating a more controlled approach to territorial expansion than many colonists desired at the time. The Proclamation ultimately set the stage for tensions that would contribute to growing discontent among American colonists, influencing the events leading to the American Revolution.

The other options, such as the Declaration of Independence, the Bill of Rights, and the Magna Carta, do not pertain to land settlement issues or decrees issued by King George III concerning colonial expansion. Each of those documents serves different purposes in history, focused on independence, rights, or limits on government power, thus not relating directly to the question of westward settlement.