Final answer:
The American Revolution influenced British North America by causing a significant Loyalist migration to Canada, leading to demographic and political changes. It also prompted Britain to pass the Constitutional Act of 1791, granting more legislative autonomy, shaping Canada's path towards parliamentary democracy.
Step-by-step explanation:
The American Revolution had profound consequences for British North America, particularly in shaping the future of Canada. The conflict led to the influx of Loyalists, British supporters, into Canada, as they fled from persecution in the newly independent United States.
This migration significantly affected the demographic and political landscape of Canada. The loyalists were instrumental in the creation of Upper Canada, now Ontario, and contributed to the development of its legal and educational systems. This migration also highlighted the differences between the English-speaking population, which grew with the Loyalists, and the existing French-speaking population, contributing to the cultural mosaic that characterizes Canada today.
Furthermore, the American Revolution prompted Britain to take a more cautious approach with its remaining North American colonies. It led to the Constitutional Act of 1791, which divided Quebec into Upper and Lower Canada and granted more legislative autonomy in an effort to quell potential unrest. This act was pivotal in Canada's parliamentary democracy evolution, contributing to forming the political systems we observe in Canada today.