Why the southern boundary of Chinuk Wawa use?

[David Robertson]

To the best of my knowledge, Chinuk Wawa wasn't much used South of the 
Oregon-California border.

Why?

Were intertribal relations of a different character from those farther 
North?

Was the economic situation different?

Was there a different language of intercultural contact, e.g. was Chileno 
(pidgin Spanish) widespread in northern California?

Were Indian-newcomer relations different enough from those in Oregon, 
Washington & BC to keep people from wanting an interethnic language?  Was 
the anti-Indian violence or genocide that erupted very early in 
California's history as a US state a factor, for example?

Your thoughts are solicited.

--Dave R

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