The British government made the Royal Proclamation of 1763 after the war , which said that white people could not live past the Appalachian Mountains , but this proclamation was largely ignored by the settlers , and the Iroquois agreed to move this line again at the Treaty of Fort Stanwix in 1768 , where they sold the British all their remaining claim to the lands between the Ohio and Tennessee Rivers . The British government issued the Royal Proclamation of 1763 after the war , forbidding white settlements beyond the Appalachian Mountains , but this proclamation was largely ignored by the settlers , and the Iroquois agreed to adjust this line again at the Treaty of Fort Stanwix ( 1768 ) , whereby they sold the British Crown all their remaining claim to the lands between the Ohio and Tennessee Rivers .