3 We intend to begin on the first of February unrestricted submarine warfare. We shall endeavor in spite of this to keep the United States of America neutral. In the event of this not succeeding, we make Mexico a proposal or alliance on the following basis: make war together, make peace together, generous financial support and an understanding on our part that Mexico is to reconquer the lost territory in Texas, New Mexico, and Arizona. . . –Zimmerman telegram, 1917 This telegram most directly contributed to which of the following? The beginning of the Spanish-American War

The Mexicans entering into a war with the United States

The Germans creating another alliance

The Americans entering WWI
which one?