I think they’re trying to tell a story about the way cities in the US and Canada are brutally malformed for moving people around in them. Mexico is much more like Central America in its modality, and so adding their stats in obscures the abnormalities that are the US and Canada.
The North America stat is fine if you’re only talking about the US and Canada… but since they left Mexico out it’s not really accurate
I think they’re trying to tell a story about the way cities in the US and Canada are brutally malformed for moving people around in them. Mexico is much more like Central America in its modality, and so adding their stats in obscures the abnormalities that are the US and Canada.