What THREE events caused the United States to enter World War I?

Question

A.
the formation of the Triple Alliance

B.
the discovery of the Zimmermann Telegram

C.
the sinking of the USS Maine in Havana

D.
the assassination of Archduke Franz Ferdinand

E.
the sinking of the RMS Lusitania by a German U-boat

F.
the use of unrestricted submarine warfare by Germany

Answer 1

The three events that contributed significantly to the United States entering World War I are:

B. the discovery of the Zimmermann Telegram
E. the sinking of the RMS Lusitania by a German U-boat
F. the use of unrestricted submarine warfare by Germany

These events highlighted the threats posed to American interests and citizens, ultimately leading to the decision to join the war.