The Proclamation stated that Americans could not settle or buy land west of a line along the Appalachian Mountains. This angered colonists. Tempted by great farm land, settlers continued to flow into the Ohio River Valley and Great Britain was unable to provide adequate protection for those colonists. Also, the Proclamation gave Great Britain a monopoly in land bought from Native Americans. The later Quebec Act, 1774 extended the rights of French Catholics, thus further angering English Protestant settlers. 