Final answer:
The fall of Quebec marked the defeat of France in North America. This British victory was crucial in establishing British control over Canada and signaled a significant shift in the contest for dominance in North America.
Step-by-step explanation:
The city whose fall marked the defeat of France in North America was Quebec. During the British and French contest for control over North America, Montreal served as a base for British operations for most of the war. The British victory in Quebec signaled a significant turning point, heavily influencing the outcome of the struggle for dominance on the continent.
The attempts to capture Quebec by the colonists were part of a larger strategy to find new allies and reduce British influence in North America. Led by American commanders like Colonel Benedict Arnold and Brigadier General Richard Montgomery against British commanders such as Captain William DE LaPlace and General Sir Guy Carleton, the Battle of Quebec resulted in a critical British victory despite the Americans' aims to align with French Canadians in Quebec.
The British victory at Quebec was a pivotal moment as the British and French had vied for control over Canada, and this victory essentially paved the way for the British dominance in the region.