January 1917 Jarmalka ayaa dib u bilaabay dagaalka aan xadidnayn ee maraakiibta hoostiisa mara iyagoo rajeynaya inay ku qasbaan Britain inay bilowdo wadahadalada nabadda. Wasiirka arimaha dibada Jarmalka, Arthur Zimmermann ayaa casuumay kacaankii burburay
Mexico si ay ugu biirto dagaalka si ay ugu biirto xulufada Jarmalka ee ka dhanka ah Maraykanka hadii Maraykanku ku dhawaaqo dagaalka Jarmalka ee Zimmermann Telegram. Taas bedelkeed, Jarmalku waxay Mexico u diri lahaayeen lacag waxayna ka caawin lahaayeen dib u soo celinta dhulalka Texas, New Mexico iyo Arizona ee Mexico ay ku weysay dagaalkii Mexico iyo Mareykanka 70 sano kahor. Sirdoonka Ingiriiska ayaa qabtay telegraamkii waxayna u gudbiyeen Washington. Wilson wuxuu shacabka usoo bandhigay warqada Zimmerman dadka Maraykanka ahna waxay u arkeen inay tahay "casus belli" - oo ah sababo dagaal.