Why was Quebec city called the guardian of New France?

Quebec city was known as the "guardian of New France" because of its strategic location and role as a fortified stronghold for the French colonial empire in North America.1

Founded by Samuel de Champlain in 1608, the city was established at a commanding site that controlled the narrowing of the St. Lawrence River estuary. This position allowed the French to regulate access to the river, which served as the primary transportation corridor and gateway to the interior of the continent, where the lucrative fur trade was centered.213

Because the St. Lawrence and its tributaries were vital to French economic and territorial control, the city became a primary target for British forces during the colonial conflicts between France and Britain. As a fortified post, Quebec city was tasked with defending the heart of New France against these constant threats, a role it maintained until the decisive Battle of Quebec in 1759.14