How did the American Expeditionary Force help the Allies win the war?

They fought several winning battles alongside the French troops.
They resupplied the weary French and British soldiers with food and munitions.
They helped reinforce the Western Front line by earning victories in the Battle of Belleau Woods and the Battle of the Argonne Forest.

They also brought fresh troops and resources to the front lines, boosting morale and providing much-needed support to the exhausted Allied forces. Additionally, the AEF helped break the stalemate on the Western Front by launching successful offensives against the German forces, ultimately helping to push them back and secure victory for the Allies.