In 1917, Germany, determined to win its war of attrition against the Allies, announced the resumption of unrestricted warfare in war-zone waters. Three days later, the United States broke diplomatic relations with Germany, and just hours after that the American liner Housatonic was sunk by a German U-boat.
The United States decision to join World War I prevented the defeat of the Allied forces in April, May and July of 1918. In August the influx of 2 million fresh American troops led to the collapse and defeat of the German forces. Without the American troops the Allies would most likely have lost the war.
I’m pretty sure it’s 90 but correct me if I’m wrong
