If my hastily Googled figures are correct, in 1745, the population of New France was around 45,000*, while British North America was nearing 1,000,000 people.
How can we bring the former up to parity with the latter? What changes would need to be made to compel more people to leave France and to settle in North America? How far back would the POD need to be?
* this apparently only refers to the St. Lawrence region, but even adding however many people lived along the Mississippi and elsewhere, it's still a tiny figure in comparison