Here are some of the reactions from European leaders:
* British Prime Minister David Lloyd George: "The arrival of the American troops on the western front was the turning point in the war."
* French Prime Minister Georges Clemenceau: "The United States is a colossus on the move. It is a sleeping giant that has been awakened."
* German Chancellor Theobald von Bethmann Hollweg: "The entry of the United States into the war is a serious blow to our hopes for victory."
* Austrian-Hungarian Foreign Minister Count Ottokar Czernin: "The United States is a formidable enemy. We must make peace with them as soon as possible."
Overall, the United States' entry into World War I had a significant impact on the course of the war. It helped to turn the tide in favor of the Allies and ultimately led to Germany's defeat.