1. Increased Allied Strength: The entry of the United States into the war brought a substantial boost to the Allied forces. The U.S. provided fresh troops, financial resources, and military supplies, bolstering the Allied cause against the Central Powers.
2. Arrival of American Expeditionary Forces: The United States sent a large expeditionary force to Europe, known as the American Expeditionary Forces (AEF), under the command of General John J. Pershing. The AEF played a critical role in various military campaigns during the war.
3. War Effort Mobilization: The U.S. government mobilized its resources and economy to support the war effort. Industries shifted to producing war-related materials, and measures were taken to conserve food and other resources.
4. Convoys and Naval Support: The United States Navy provided crucial naval support, helping to secure vital shipping lanes in the Atlantic and protect Allied merchant ships from German U-boat attacks.
5. Meuse-Argonne Offensive: The AEF's most significant contribution was the Meuse-Argonne Offensive in September-November 1918. This large-scale operation, in which over a million American troops participated, played a decisive role in breaking the German lines and hastening the end of the war.
6. Armistice and End of the War: The successful Allied offensives, including those involving American forces, led to the signing of an armistice on November 11, 1918, marking the end of World War I.
The involvement of the United States had a significant impact on the outcome of the war, contributing to the Allied victory and accelerating the end of the conflict.