How did the American expeditionary forces help? The allies win the war?

Question

A they convinced German troops to rebel against their leaders
B they had secret with the German Kaiser, which eventually led to in armistice
C they assisted the French in British troops in the victory of the battle of blue Wood and the battle of the agony forest
D they trained the Harlem hellfigjters

Answer 1

C they assisted the French and British troops in the victory of the battle of Belleau Wood and the Battle of the Argonne Forest.