So an American expat in Mexico could be, as I said, born in the USA to Mexican parents, meaning that they have US citizenship but then emigrated to the country of their parents' birth. They could also be what Malbaby said, assuming that they were born in Mexico, emigrated to the USA, were naturalized there to gain citizenship, and then returned to Mexico. Which happens. Though I think what I said is more common and more likely.
Also, why use a question mark at the end of an interrogative sentence when you could save pixels and use a period.
Couldn't help it. I'm sorry.
US Ambassador to Saudi said that recently regarding coronavirus outbreak: