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The American Expeditionary Forces (AEF) made several key contributions to the Allied victory in World War I. Some of the most significant contributions include:

1. Troop Reinforcements: The AEF provided much-needed reinforcements to the exhausted Allied forces on the Western Front. The arrival of fresh American troops boosted the morale and combat strength of the Allies.

2. Resources and Supplies: The AEF supplied the Allies with essential resources, including food, ammunition, and equipment, which helped sustain the war effort and alleviate shortages.

3. Combat Capabilities: American troops brought innovative combat tactics, such as the use of combined arms and small unit leadership, which contributed to the overall effectiveness of Allied operations.

4. Strategic Offensives: The AEF played a crucial role in several major offensives, including the Meuse-Argonne Offensive, which was one of the final and most decisive campaigns of the war.

5. Psychological Impact: The presence of American forces on the battlefield had a significant psychological impact on both the Central Powers and the Allied troops, signaling a shift in the balance of power.

These contributions, among others, helped tip the scales in favor of the Allies and ultimately led to their victory in World War I.