Kammala jumla mai zuwa: Yaƙin kan iyakar Mexico, ko Kamfen na kan iyaka, yana nufin ayyukan soja da suka faru a yankin Mexico da Amurka na iyakar Arewacin Amurka a lokacin juyin juya halin Mexico. Lokacin yakin ya hada da yakin duniya na farko, lokacin da Jamus ta yi ƙoƙari ta sa Mexico ta kai hari ga Amurka kuma ta shiga cikin tashin hankali a kan sojojin Amurka a can kanta. Yaƙin kan iyaka shi ne karo na biyar da na ƙarshe da aka yi a ƙasar Amurka, inda magabata su ne Yakin Juyin Juya Halin Amurka, Yakin 1812, Mexican-American War (1846-1848) da kuma yakin basasar Amurka. Ƙarshen juyin juya halin Mexico a ranar 1 ga Disamba, 1920, ya nuna ƙarshen iyakar Amurka. Yakin 'yan fashi a Texas wani bangare ne na Yakin kan iyaka. Daga farkon juyin juya halin Mexico a 1910, sojojin Amurka sun kasance a cikin karfi a kan iyaka kuma a lokuta da dama sun yi yaƙi da 'yan tawayen Mexico ko tarayya. Babban rikici ya zo ne a shekara ta 1916 lokacin da mai juyin juya hali Pancho Villa ya kai hari kan garin Columbus na Amurka, New Mexico. A sakamakon haka, sojojin Amurka, karkashin jagorancin Janar John J. Pershing, sun kaddamar da wani
tafiya zuwa arewacin Mexico, don gano da kuma kama Villa. Kodayake ba a kama Villa ba, sojojin Amurka sun sami 'yan tawaye na Villista kuma suka kashe su, suka kashe manyan jami'an Villa guda biyu. Mai juyin juya halin kansa ya tsere kuma sojojin Amurka sun koma Amurka a watan Janairun 1917. Rikici a kan iyakar ya ci gaba, duk da haka, kuma Amurka ta kaddamar da wasu ƙarin, ko da yake ƙananan ayyuka a cikin yankin Mexico har sai bayan nasarar Amurka a yakin Ambos Nogales a watan Agustan 1918, wanda ya haifar da kafa wani bango na dindindin. Rikici ba wai kawai batun Villistas da Amurkawa ba ne; "Maderistas", "Carrancistas", "Constitutionalistas" da Jamusawa suma sun yi yaƙi da sojojin Amurka a wannan lokacin.