Answer:
With the Americans Joining the war, the spirit of the German people began to crumble
Explanation:
The war had been brought to a complete standstill between the central powers and the Triple Entante, The Germans were already being prepared to bail out of the war, but so were its enemies. However, when America joined the war, the allies got a second wind, and the German's morale and hopes of winning were eminently crushed. With the arrival of fresh troops into France, and new tactics and weapons like the Trenchgun or the M1 Flamethrower, Germany eventually threw in the towel before things got worse.
