(A) It looked like the Central Powers were winning
(B) Austria-Hungary invaded Mexico
(C) Germany invaded Canada
(D) ** German u-boats sank the Lusitania and American merchant ships
EXPLANATIONS BELOW
Concept note-1: -President Woodrow Wilson, however, took a cautious approach to responding to the attack, demanding from Germany an apology, compensation for American victims, and a pledge to discontinue unannounced submarine warfare.
Concept note-2: -The United States later declared war on German ally Austria-Hungary on December 7, 1917. 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-3: -12/11/1941. Following the Declaration of War on Japan on December 8, 1941, the other Axis nations of Germany and Italy declared war on the United States. Congress responded, formally declaring a state of war with Germany in this Joint Resolution on December 11, 1941.
Concept note-4: -Lusitania, British ocean liner, the sinking of which by a German U-boat on May 7, 1915, contributed indirectly to the entry of the United States into World War I.