Answer is the rise of Imperialism.
The main aggressor during WWl is considered to be Germany.
Overruled the French monarchy
B. France believed Germany would not invade or attack their nation
In the early stages of the war, France and Germany were at a stalemate with hardly any action in the western front until the German blitzkrieg on May 10th, 1940 which caught allied forces off guard. The encirclement of British forces at Dunkirk and the fall of Paris led to the surrender of France.
