(A) Germany’s invasion of Belgium
(B) the desire to collect reparations
(C) Russia’s decision to leave the war
(D) ** Germany’s decision to resume unrestricted submarine warfare
EXPLANATIONS BELOW
Concept note-1: -Wilson cited Germany’s violation of its pledge to suspend unrestricted submarine warfare in the North Atlantic and the Mediterranean, and its attempts to entice Mexico into an alliance against the United States, as his reasons for declaring war.
Concept note-2: -The immediate cause of American entry into World War I was: Germany’s resumption of unrestricted submarine warfare. Wilson and his administration aroused the still-divided American people to fervent support of the war by: Proclaiming the conflict an ideological war to end all war and make the world safe for democracy.