Final answer:
After the Battle of Chateau-Thierry, American forces continued to advance, playing a key role in the Second Battle of the Marne, and contributing to the offensives at Saint-Mihiel and Meuse-Argonne, aiding the Allied victory in World War I.
Step-by-step explanation:
After the American troops' involvement in the Battle of Chateau-Thierry, they continued their offensive in Europe which included other significant battles. Following their repelling of the German advance, American forces helped the Allied Expeditionary Force (AEF) win the Second Battle of the Marne in July 1918. The AEF's victories included mounting offensives against German positions at Saint-Mihiel and the Meuse-Argonne offensive from September 1918 onwards, which were crucial in the Allied powers' push against the German forces. The strategy and valor of the American and Allied forces led to turning the tide of World War I in favor of the Allies.