My dad loved it in the '80s, and I read it some time in the late 80s when I was in my tweens. I probably didn't understand a lot, and I've forgotten a lot, but that map is good, and I do use it a short hand a lot in my thinking to this day.
Though I do think that some peopleº treat it as more than a short hand - and like all stereotypes it can cause more harm than good when actually believed.
º I recently heard a barista talking passionately about "Freeing Cascadiaºº"
ººNot literally one of the 9 nations, but a related idea
Cascadia the idea appears to be growing in the Seattle region.
Can't say I entirely disagree: the PNW does have a definite bent to its culture (I've lived in PNW^H^H^HCascadia for about a year now - loving it so far).
Though I do think that some peopleº treat it as more than a short hand - and like all stereotypes it can cause more harm than good when actually believed.
º I recently heard a barista talking passionately about "Freeing Cascadiaºº"
ººNot literally one of the 9 nations, but a related idea