British officials reserved the land west of the Appalachian Mountains for American Indians.
Explanation:
King George Third issued the Royal Proclamation of 1763 on October 7, 1763. It was issued when Britain managed to acquire French areas in North America after winning seven years war. The proclamation prohibited any settlement west of Appalachian mountains. It was proclaimed to be an Indian reserve. Exclusion of the area beyond Appalachian mountain filled colonialists with discontent and it arose during the American revolution.