What was the United States’ contribution to Germany’s defeat in WWI?

The massive manpower of the United States had overwhelmed German forces.

Explanation:

The Americans had helped push back the Germans after the long stalemate of trench warfare. They had used weapons such as the shotgun to cause massive casualties to German troops. As they pushed back to German borders, Germany had agreed to an armistice, officially ending the war.

in november 1781, john hanson became the first president of the united states in congress assembled, under the articles of confederation. many people have argued that john hanson, and not george washington, was the first president of the united states, but this is not quite true.

explanation: