Follow up: Is this due purely to native French Birthrates? Did the wars (especially WW1) cutting down generations of men have a significant impact?

During the long 19th century leading up to WW1, France suffered a series of demographic setbacks while simultaneously experiencing successive waves of emigration to new areas of European settlement. Beginning just before the French Revolution, crop failures and famine stalked France and significantly contributed to social unrest that sparked the Revolution. The high population density of France compared with the rest of Europe made France uniquely susceptible to famine into the middle of the 19th century. Then, in the wake of the revolution, which caused massive social disruption, emigration from France, and societal upheaval, France essentially warred with the rest of Europe between 1792-1815, during the Wars of the First and Second Coalitions and ensuing Napoleonic Wars, which had devastating effects of the demographics of France. Here is where you begin to see significant stagnation in population growth, only to be completely stunted by WW1. Just like WW1 had devastating effects on the population of France, so did the Napoleonic wars 100 years prior.

I think this has been partially answered in a previous thread by /u/ https://www.reddit.com/r/AskHistorians/comments/xdw65/what_are_the_factors_behind_of_the_slow/c5ljsos

Follow-up question: several answers hint at the fact than France had a particularly large population density in medieval and early modern times, but why is that ? Strong economy, lack of new land to settle, good soils for premodern techniques ?

What effect did the death rate among French males during the Napoleonic wars have on the subsequent population growth in France?