wait wait wait.......

America declared war on "der dritten Reich" (Nazi Germany)
and when you declare war it is your intent to crush all enemy opposition, and Nazi germany would be hard to crush if the allied nations had just walked around and completly ignored France, they had to throw the Nazis out of France, they had no choice!!!
It was a means to an end, and besides, I don´t think that the leaders of the allied nations at that time decided to liberate France solely for the reason that France would be indebted to them, I don´t think that was even thought of!!!