The impact of United States joining the war in the side of the Triple Entente renewed the morale of the allied army because of fresh supplies and manpower that United States was able to supply to the battlefront. It also supported the allied powers with large amount of equipment and weapons to supply the war-torn units of the French and the British. Also the addition of US forces in the war add a bulwark of manpower to replenish and fill up the ranks of the allied army during the war.
