What effect did the entry of the U.S. have on WWI?

The U.S.
made major contributions to the war for a major effect despite coming in only one year before
the Armistice was signed.

The weary allied soldiers enthusiastically welcomed
American troops in the summer of 1918. They arrived at the rate of nearly 10,000 per day at a
time when the Germans were not able to replace their losses. This shifted the momentum of the
war from a near deadlock to a slow but steady offensive march toward Germany. The American army
played a central role in the Hundred Days offensive that eventually forced the Germans to
surrender at the end of 1918.

The U.S. Navy meanwhile helped guard convoys
across the Atlantic. The also sent a battle group to the Scapa Flow to join the British Grand
Fleet.

American largest contributions came at the peace table, where
President Woodrow Wilson helped draft the Treaty of Versailles. Wilson also helped to create the
League of Nations, forerunner to the modern UN. Although the U.S. Senate didnt approve the final
treaty, the U.S. still played a key role in global politics until the Great Depression focused
them to look inside their own borders rather than beyond them.