4. Why was
The sole reason why France was able to recover opposed to Germany was because France became unified while Germany did not. The Germans weren't able to participate in the European economy after the war due to the fact they had little or no new world assets. The only income that was coming in was from the new worlds. The little assets/income Germany had were split through some of the German states. At the time Germany had 300 separate states so they had no unified capital. Opposed to France who was able to become a nation again to create a capital and participate in the European economy.
It's also important to note that a majority of the wars was fought on the German soil, damaging cities in Germany forcing it to be even more difficult to recover.