France demonstrated twice in this period - in the Eighteenth and Nineteenth centuries - that they could not get enough resources (human and otherwise) into North America to hold it in the face of an enemy that had a stronger resources base in North America.
I wouldn't say they couldn't do it; France was the most populous European kingdom at this time, after all. It was more that North America simply wasn't that high of a priority for the French crown. Canada produced two main export items, furs and fish, and neither required massive human settlement. In fact, massive settlement would have been detrimental to the population of fur-bearing animals. French kings in general seemed to view the Americas more as a place to make money than a place to settle lots of people.
Saint-Domingue was a high priority and France was strongly committed to defending and holding onto it. The problem in 1803 - aside from the yellow fever epidemic that wiped out Leclerc's army - was that external circumstances (the renewal of war in Europe) forced Napoleon to turn elsewhere. If he had remained at peace in Europe, he surely would have sent reinforcements to the colony.
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