Alliances was signed and if one alli declares war first than the other country goes into war.
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Jeannette Rankin did not want the United States to enter the World War 1.
Germany would not agree to end its naval attacks.
The sinking of the Lusitania by the German U-boat and the Zimmermann note made the United States want to enter the war (on the Allies side)
The attack by the Japanese on the U.S. naval base at Pearl Harbor in Honolulu, Hawaii was the event that caused the United States to enter World War II.