(A) unrestricted submarine warfare by the Germans
(B) interception of the Zimmerman telegram
(C) ** Prohibition
(D) yellow journalism about the sinking of the Lusitania
EXPLANATIONS BELOW
Concept note-1: -Germany’s resumption of submarine attacks on passenger and merchant ships in 1917 became the primary motivation behind Wilson’s decision to lead the United States into World War I.
Concept note-2: -Volstead Act In 1917, after the United States entered World War I, President Woodrow Wilson instituted a temporary wartime prohibition in order to save grain for producing food.
Concept note-3: -Following U.S. entry into the WWI in 1917, increased anti-German propaganda for the war effort led to popular hysteria against German Americans. This proved beneficial for the Anti-Saloon League and the Prohibition movement as most breweries were owned by German Americans, .