I am Canadian. People in Europe would always ask if I was American after hearing me speak, and their faces would always lighten up when I told them I was Canadian.
In Spain it was the worst. I would sometimes overhear service staff tell each other I was American and proceed to get awful service. It got to the point that I started going in to random stores to try to (unsuccessfully) find something with a Canadian flag on it.
I will try my best to be obviously Canadian next time.
It links a paper that explains it! https://www.sciencedirect.com/science/article/abs/pii/S0094576525002838