The
of 1763 prohibited colonists to
settle west of the Appalachian Mountains.

After Britain won the Seven Years' War and gained land in North America, it issued the Royal Proclamation of 1763, which prohibited American colonists from settling west of Appalachia. The Treaty of Paris, which marked the end of the French and Indian War, granted Britain a great deal of valuable North American land.

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there is an explationation of this on a site called crash   course world history 1

answer; no longer than a reasonable period of time;