Another Canadian here a few hours north of WA, and yeah, this tracks. Pacific Northwest, interior region. The Grand Rapids and Buffalo things are from two specific words, "pop" and "sneakers". But yeah, that deep red over the middle of WA is pretty accurate.
I wonder if we had a Canadian version of this, how the Americans around the border would differ/be the same. I'm interested to see how we affect each other.
Untested though? My British-isms. They aren't as bad as they used to be, but I grew up with and still watch a lot of UK shows, and I had six months of... cultural immersion... with the British Army in Bosnia. So my accent and speech patterns have some other influences happening.
Having done this or similar test before m favorite thing is knowing they will where I am from because of Mischief Night and be confused by everything else