Comment by cgrubb

> It was used so extensively that it was the language of courts and newspapers in the Pacific Northwest from about 1800 to 1905. This makes it sound like all the newspapers were in Chinook Jargon. But the only such paper I've been able to find was this https://en.wikipedia.org/wiki/Kamloops_Wawa —first published in 1891 and doesn't seem to have had too wide of a circulation.