This may sound like a trick question, but who do you think actually invented the concept of French Fries? The automatic answer is probably going to be the French, and that is certainly one of the theories that are out there. However, there is some international scandal that has yet to be resolved.
On the one side, there is the argument that they were invented by Parisian street vendors around the time of the French Revolution. On the other side, there are the Belgians who claim that they started it and then a vendor from France saw the idea and copied it.
At the end of the day, it is up to you as to who you believe. For most people the mere fact that they are called French Fries and not Belgian Fries is going to be the answer that they are most content with.