malborough, it seems you don't read my words...
First, I agree with Oda Nobunaga : the French have the Franks as ancestors (but they're not the only ones). I don't know if you saw it, malborough, but I'm French and nothing else (mmmh, I'm European too

), and so I know everything you say about France (except for the Middle Ages, a little). It's a matter of definition : France didn't start to exist on a very special day, but gradually. Still, until Charlemagne there was the Frankish kingdom. Afterwards we had Francia Occidentalis, Francia Orientalis and Media Francia. From then on, Francia Occidentalis became known as France, and didn't suffer any major change in population, territory, etc...
Culture is a very long-term element. A civilization will be successful regarding its culture if it stays alive centuries or millenia afterwards. I don't know how you can apply this to the very short-term event that WWI was. I said that France ALMOST collapsed during WWI. The battle of the Marne was a decisive event to save Paris and France, and lead to the war of the trenches. If it wasn't for British help, France probably wouldn't have faced Germany very long, and Germany had 2 fronts !!! I'm sorry but, even though France may have been a better cultural place at the time, Germany was far superior, its industry and army wasn't matched. To put it short, Germany understood the XXth century where France didn't. 25 years later France lost to Germany in 1 month, showing its real weakness. But that's no surprise : with all the events that happened during the XIXth century, France was more into social advances than industrial revolution.
Now, I agree that the Third Republic was a stable period that brought a lot to the country, but mentalities were stuck in the revenge about Alsace-Lorraine, thanks to Napoleon III's stupidity. One funny example to show you France's backwardness : at the beginning of WWI, French infantry wore colourful uniforms, in the best tradition, so that they were easily spotted by the Germans, who had already changed their uniforms to something more into dark/brown colours. How can you compare that with Louis XIV's reign or even Napoleon's tales, where they faced all Europe ?