How to Understand France

France is weird.

Why is it the biggest sea country in the world? Why was it the most powerful? Why is it not even the most powerful in Europe anymore? Why is it the only country in the continent that belongs both to the north and the south? While most nations in the continent have formed in the last couple of centuries, France has been around for over a thousand years. Why so long?

If we understand this, we can understand France better, but also a lot of why the world is the way it is today.