No studies of British Columbia versions of the Jargon have demonstrated creolization. The range of varying usages and vocabulary in different regions suggests that localization did occur — although not on the pattern of Grand Ronde where Wasco, Klickitat and other peoples adopted and added to the version of the Jargon that developed there. First-language speakers of the Chinook Jargon were common in BC (native and non-native), until the mid-20th century. It is a truism that while after 1850 the Wawa was mostly a native language in the United States portion of the Chinook-speaking world, it remained in wide use among non-natives north of the border for another century, especially in wilderness areas and work environments. Local creolizations probably did occur in British Columbia, but recorded materials have not been studied as they were made due to the focus on the traditional aboriginal languages.