Answer:
After the battle of Marne the German military realized that the inclusion of americas in the war would probably help to keep them from winning the war.
Step-by-step explanation:
The american Soldiers fought the Battle of Marne under French command. Their inclusion to the battlefield make them reinforce the front in the vicinity of paris. Their Freshness, adaptation, coordination and lack of frustration made the American soldiers perfect fit to it. The battle of marne was a long and very difficult fight that weakened both sides, but the optimus state of the american soldiers, provided the alliance of France and Britain among others, the perfect countermeasure to the German focus on war. They boosted the resistance against germany by refreshing it with their support.