In July 1914, when the war started in Europe. Woodrow Wilson wanted to stay neutral in the war. This is because the war was across the world, we were doing good economy at the time, and we were in the middle of all the other countries.
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Belgium was neutral in the war. But then, on August 4, 1914, Germany declares war in France. To get to the French, the Germans had to go through Belgium. They demanded free passageway, which Belgium refused and German started war with them.
On May 7, 1915, Germany's submarine torpedoed a British steamship. Killing 1,128 people, including 128 Americans. Germany broke the Naval rules and killed civilians. Word got to The United States, and people weren't happy.
The United States
In January 1917, Germany asked Mexico with the Zimmermann telegraph to have a alliance with them if The United States joined the war. But the British got the letter interpreted it and told the United States.
In February 1917, Germany was destroying ship that was bring supplies to the British, because the British blocked off the German supply port. So the Germans used their U-boats to attack supply boats.
In April 6, 1917 The United States joined World War 1. When they joined they joined the Triple Entente.