DC,  Check this document out to begin testing your CA, WA, OR theory:  https://www.census.gov/population/www/documentation/twps0076/twps0076.pdf

You know what surprised me the most?  The number of blacks that lived in Oregon from 1850 -1927 while the Black Exclusion laws were in effect.  I wonder how that could be possible?  What were all those white Oregon racists thinking and doing?  Why weren't the laws being enforced?