(A) The sinking of the Lusitania
(B) The Zimmerman note
(C) Germany’s submarine warfare
(D) ** Shared German ancestry
EXPLANATIONS BELOW
Concept note-1: -On April 6, 1917, Congress approved a resolution declaring war with Germany. The Senate approved the resolution by a vote of 82-6 on April 4, 1917.
Concept note-2: -On September 3, 1939, in response to Hitler’s invasion of Poland, Britain and France, both allies of the overrun nation declare war on Germany.
Concept note-3: -On April 2, 1917, President Woodrow Wilson delivered this address to a joint session of Congress and called for a declaration of war against Germany. The resulting congressional vote brought the United States into World War I.