What was the major contribution that US made to WW1?

1. Providing fresh troops to the Western Front. The arrival of American troops in large numbers in 1917-1918 helped to turn the tide of the war in favor of the Allies. By the end of the war, there were over 2 million American soldiers in Europe.

2. Enhancing Allied logistical capabilities. The United States provided the Allies with vast quantities of food, munitions, and other supplies, which were critical to their war efforts. The US also built thousands of miles of railroads, roads, and bridges in France to support the movement of troops and supplies.

3. Financial assistance to the Allies. The United States lent billions of dollars to the Allied powers, which helped them to finance their war efforts and to purchase American supplies.

4. Developing new military technologies. The United States developed a number of new military technologies during the war, including the M1917 Enfield rifle, the Browning Automatic Rifle, and the Liberty aircraft engine. These technologies gave the Allies a significant advantage over the Germans.

5. Raising morale. The entry of the United States into the war helped to boost the morale of the Allies and to inspire them to victory. The American troops were seen as a fresh, energetic force that would help to turn the tide of the war.

6. Defeated the Central Powers. The US military played a decisive role in defeating the German army and its allies in World War I. On November 11, 1918, the German government signed an armistice with the Allies, officially ending the war.