Zimmerman Telegram - In February of 1917 Arthur Zimmermann, Germany's Foreign Minister, sent a telegram to Mexico that proposed Mexico join Germany in their fight. In return, Germany would help Mexico "'reconquer" New Mexico, Texas, and Arizona from the United States.
On April 12. 1917. President Woodrow Wilson asked Congress to declare war on the Central Powers - Germany. Austria-Hungary, and the Ottoman Empire.
The treaty called for the Central Powers to pay reparations- money to pay for war damages.
The treaty also formally recognized the creation of the League of Nations.
Many Americans were opposed to the League of Nations. Many Americans felt that the League of Nations would only ensure that they would get caught up in future European disputes, and that these disputes had the potential to ruin the United States. In the end, the U.S. did not join the League of Nations and it was very ineffective.