I know that apparently, some American travelers put Canadian flags on their luggage or carry on then claiming they’re from Canada (the dead giveaway on debunking this is their passport, since how can you be “Canadian” when you have US citizenship unless you’re a dual citizen in possession of both nationalities) since some of them have hatred towards the US or feel ashamed of the country due to its internal affairs.
The idea is fairly old. I think the first time I heard it was the latter part of the Bush era? Someone told me secondhand about how having a Canadian flag on the backpack makes some airports friendlier. that’s also around when I started traveling internationally for work so it could have been around even earlier than that. I never knew any Americans who actually did it. I did work with a lot of Southerners and we all had distinctively American accents, so I don’t think we could have pulled it off. Maybe a Minnesotan could pass.
Yoooers can for sure. It’s such an uncommon accent (there aren’t that many people in the UP and northeast Wisconsin to begin with, and most people who grow up there don’t leave or travel all that much) but so close to stereotypically Canadian that it threw me the first dozen or so times I heard it.