Final answer:
The Proclamation of 1763 forbade colonists from settling west of the Appalachian Mountains to prevent conflict with Native American tribes and to save money on defense after the Seven Years' War.
Step-by-step explanation:
The Proclamation of 1763, issued by the British government, forbade colonists from settling west of a line drawn along the Appalachian Mountains. This proclamation was aimed at preventing conflict with Native American tribes in the Ohio Valley. It also sought to avoid the costs of defending the frontier after the Seven Years' War. Colonists, however, disregarded the proclamation and continued to move westward.