 Kutaura kusinganzwisisiki mu Oregon Treaty pamusoro penzira yemuganhu, iyo yaifanira kutevera mugero wakadzika kuenda kuStrait yeJuan de Fuca uye mberi kugungwa rakazaruka, kwakaguma muHondo yeNguruve, imwe nharo yemuganhu muna 1859 pamusoro peSan Juan Islands. Kurwisana kwacho kwakagadziriswa nenzira ine rugare pashure pemakore gumi okurwisana nokunyanyisa kwechiuto apo zviremera zveBritain zvomunzvimbomo zvakaramba zvichinyengetedza London kuti itorezve nharaunda yePuget Sound yose zvayo, sezvo vaAmerica vakanga vakabatikana kune imwe nzvimbo neHondo yeVanhu. Kurwisana kweSan Juans hakuna kugadziriswa kutozosvikira muna 1872 apo, maererano neChibvumirano cheWashington cha1871, mutongi William I, mambo weGermany akasarudza muganhu weAmerica unofarira mugungwa kuburikidza neHaro Strait, kumadokero kwezvitsuwa, pamusoro peBritish inoda Rosario Strait iyo yaive kumabvazuva kwavo. 