> I ask since a significant chunk of people from the US cannot find Mexico on a map ...

I love these comments. Don't worry: A "significant chunk of people" from Europe also cannot find Mexico on a map. Really, these comments say nothing. They are like "man on the street with a microphone" gotchas. Anybody under 30 years old has a mobile phone with Internet: They open their maps app, and search for Mexico. Done: Borders the southwestern United States.