The Evolution of Ontario's Boundaries - 1791

The American Revolution and the arrival of the Loyalists led to the Constitutional Act (1791), which separated the Province of Quebec into Upper Canada (current southern Ontario) and Lower Canada (current southern Quebec).

Map scanned from the Economic Atlas of Ontario / Atlas Économique de l'Ontario
W. G. Dean, Editor/ Directeur; G. J. Mathews, Cartographer/ Cartographe
Printed 1969 by University of Toronto Press for the Government of Ontario