Because of her treaty with Belgium, the Maginot Line did not extend through the Belgian border. The world’s strongest defensive line had a back door. The Germans took note of it.
Static thinking occupied more than just the French military minds. The French people were paralyzed by the thought of the their dead, and they looked towards the possibility of another war with heavy hearts. Only the French Communists, with funding from the Soviet Union, actively opposed the newly risen German nationalism. Many French citizens tried to put it out of their mind.
But the move to reestablish “Greater Germany” could not be ignored. Like the British, the French were deeply concerned by the German reoccupation of the Rhine in 1936. Unlike the British, the French had the means to do something about it. But without British support, the French do not move. The Nazis reoccupy the Rhine without incident.
Daladier, the French Premier, went to Munich in 1938 and with Britain, allowed Germany to carve up the Sudetanland. So far Hitler and the Nazis had not used overt military force to attack the West, and everyone in Britain and France hoped that the Germans would make no more demands. The growing reports of anti-Semitic violence and strong-arm tactics in the new provinces of the Reich were discounted or ignored.
As Germany made noises to reclaim the Polish Corridor to Danzig, Britain and France made guarantees to the Polish government. In the event of an attack, the West would come to the defense of Poland.
On September 1, 1939, Germany attacked Poland. Britain and France knew that this could not be allowed to stand, and declared war on September 2, 1939. Hitler had begun the Second World War, but all the world’s leaders shared the blame through their inaction.