 Nyorai kupfuurira kweiyi ndima - Mugwagwa weRoxham wakadzivirirwa mumativi ose ari maviri pamuganhu muma1970. Border Patrol yeU.S. yakanga yatanga kuisa magedhi pane dzimwe nzvimbo dzisingachengetwi dzokupinda nadzo mumuganhu wapanyika muNew York neVermont kudzivisa kutengesa zvisiri pamutemo pakuvamba kwegumi remakore. Canada yakavhara nzira dzose dzokuyambuka dzisina kudzorwa kudivi rayo sorutivi rwemibato yechengeteko inotsigira Mitambo yeOlympic yeZhizha ya 1976, ichitya kuti magandanga akafanana naavo vakanga vauraya vatambi veIsrael paMitambo yeOlympic yeMunich ya 1972aigona kuita chimwe chinhu chakafanana muMontreal, uko mitambo yakaitwa, uye ipapo kutiza nokukurumidza mhiri kwemuganhu. Mumakore okuma1980, apo kutama zvisiri pamutemo kwainyanya kubva kuCanada kuenda kuU.S., Border Patrol yakawedzera izvi nemichina yokurinda yemagetsi. 