Why French colonies in America never became heavily populated?

French colonies in America, particularly in Canada and Louisiana, never became heavily populated primarily due to their focus on fur trading rather than large-scale agriculture. The harsh climate and challenging geography limited agricultural development, and many settlers were drawn to the more lucrative fur trade with Indigenous peoples. Additionally, French colonial policies encouraged a relatively small number of settlers, with a focus on maintaining control over trade routes rather than establishing large settlements. As a result, French colonies remained sparsely populated compared to English colonies.