 Nyorai kupfuurira kweiyi ndima - Muna 1792, Kaputeni Robert Gray akawana Grays Harbor ndokupinda muRwizi rweColumbia, vanhu vokutanga vasiri vomunzvimbomo vakadaro. Muna 1803, Mutungamiri Thomas Jefferson akatumira boka raLewis naClarkkuongorora nzvimbo huru yomukati pakati porwizi rweMissouri nePacific Ocean. Kunyange zvazvo rwendo rwacho rwakasimbisa zvirevo zveAmerica kuOregon Country, rwakakundikana kuwana nzira inoshanda yengoro. Yakanga isiri kusvikira Oregon Trail yatanga kushandiswa nevagari veAmerica muma1840s kuti kutonga kweBritain kwePacific Northwest, muchimiro cheHudsons Bay Company, kwakave kunetswa. 