In what year did the United States enter World War I?

The United States entered World War I on April 6, 1917, before that it occupied neutrality. On the Western Front, they began fighting in October 1917, and on the Italian Front in July 1918. The escalating conflict between the United States and Germany began when, in 1915, a German submarine sank the British passenger ship Lusitania. As a result, more than 100 American citizens died. Then, in February and March 1917, several more American ships were sunk in the same way. During the war, the United States supplied weapons and military equipment to Germany. But after the sinking of the ships, the United States completely severs all diplomatic relations with Germany and declares war.