Rubuta ci gaba ga wannan sakin layi - Ga Coolidge, Yakin Spain da Amurka ya nuna "farkon wani zamani" (C121). Kashewa daga Monroe Doctrine, Amurka ta shiga cikin siyasar duniya ta hanyar shiga rikici na soja tare da Spain. Duk da yake sanannun abubuwan da ke haifar da yaƙi sun haɗa da nutsewar USS Maine da labarai masu ban mamaki game da Juyin Juya Halin Cuba daga Joseph Pulitzer's "New York World" da William Randolph Hearst's "New York Journal", Coolidge ya sami ƙarin dalilai da yawa don yaƙin da Spain. Wadannan sun hada da rashin dangantaka tsakanin kasashen da kuma sha'awar Amurka na yada tasirinsa a cikin yankunan Spain. ((122-123) Yaƙin da kanta zuwa Coolidge ba shi da daraja a tattauna dalla-dalla, "Yaƙin ya kasance ɗan gajeren lokaci ba tare da jini ba tsakanin al'ummomi biyu na albarkatun da ba daidai ba. Akwai fadace-fadace guda uku da suka cancanci wannan suna, - biyu a kan ruwa da daya a kan ƙasa. "
, da kuma San Juan Hill. Duk da yake ya yaba da kokarin sojojin Amurka, ya lura cewa raguwar tasirin Spain a matsayin ikon duniya shine babban dalilin nasarar Amurka. Wasu masana tarihi sun ce sojojin Amirka ba su da kayan aiki, ba su da shiri, kuma ba su da yawa. Yaƙin, kodayake a takaice a ainihin lokacin da aka yi yaƙi, ya kawo canje-canje masu yawa ga Cuba da Amurka. Waɗannan sun haɗa da ƙarin tasirin Amurka ta hanyar samun damar ruwa zuwa tekun Pacific, Atlantic da Caribbean, da 'yantar da Cuba, da kuma ƙaruwar martabar duniya ga Amurka. Coolidge yayi sharhi game da wannan suna, "Shahararren dukiyar kasar da wadata, da basira da iyawar da mazaunanta ke da shi, kuma musamman ma sha'awar su na neman kudi, ya yadu sosai".