Why do most Canadian live 100 miles from the US border?

Most Canadians live within 100 miles of the US border due to a combination of historical, geographical, and economic factors. The southern regions of Canada have milder climates, more arable land, and better access to resources, making them more attractive for settlement and development. Additionally, proximity to the US facilitates trade and economic opportunities, as well as cultural exchange. The vast northern areas, while rich in Natural Resources, are less hospitable and have lower population densities.