The correct answer is 4) U.S. leaders argued that the stage of war might shift from European soil to territory in the United States.
The statement that describes a reason for U.S. involvement in World War I is "U.S. leaders argued that the stage of war might shift from European soil to territory in the United States."
After maintaining a foreign policy of neutrality, the United States entered World War 1 on April 6, 1917. Two major reasons made President Wilson enter the war. The first one, the Zimmerman telegraph that the United States intelligence intercepted. In the telegram, the Germans asked the help of Mexico in the war. The other major reason was the sinking of the Lusitania ship bu the German navy.