Final answer:
Around one third of Canadians reside in Ontario, which is the most populated province in Canada due to its proximity to the US and economic opportunities.
Step-by-step explanation:
One third of all Canadians live in the province of Ontario. This province, which is often referred to as South Canada, is the most populated in the country with about 39 percent of the nation's total population. The large concentration of Canadians in Ontario is due to its southern location, which is closer to the densely populated areas of the United States, as well as its economic opportunities, including fertile farmland.