How did the Constitutional Act of 1791 divide the colony of Quebec?

The Constitutional Act of 1791 divided the colony of Quebec along the Ottawa River into two separate provinces: Lower Canada (the future Quebec) and Upper Canada (the future Ontario).12

This division was prompted by the influx of British loyalists into Quebec following the American Revolution. These settlers demanded land and representative government, forcing the British to alter existing constitutional arrangements. The act aimed to reproduce the general principles of the British constitution in both provinces, providing for a governor, an appointed legislative council, and an elected legislative assembly.12