France had an unusually low birth rate for much of the 1800s, all the way up through WW2.
For one thing, I have no idea what caused this. What factors do you think were most important in this trend?
And also, how can it be avoided, if at all possible?
Its clear that the decline in French Birth Rate made them at a demographical disadvantage to the Germans, and their own commanders commented on this notably.
Do you see a more fertile France keeping its status as a world power up until today if this can be avoided?