Excerpts from These Truths, pages 80-91:
But the [Seven Years] war had left Britain nearly bankrupt. The fighting had nearly doubled Britain's debt, ... the king’s ministers determined that defending the empire’s new North American borders would require ten thousand troops or more, especially after a confederation of Indians led by an Ottawa chief named Pontiac captured British forts in the Great Lakes and Ohio Valley.
Fearing the cost of suppressing more Indian uprisings, George III issued a proclamation decreeing that no colonists could settle west of the Appalachian Mountains, a line that