I think it's because you don't "do" born you "are" born...But not pretty sure

Porque " nacer" no tiene un equivalente directo en inglés, no hay una forma activa del verbo.

"nacer" == "to be born" (pasivo)

@Kai E - it's interesting how different language families have different concepts.

German and Slovenian have the same concept of "being born" being a "passive thing", "geboren werden" and "biti rojen" respectively.

And a completely unrelated but fun fact: classical Greek (I'm not sure if modern Greek does, too) had a verb for "being well, living healthily", ὑγιεινειν

"were" implies the location is what is being asked, did, implies the act is in question, example, did you mom give birth to you in Mexico? vs. "were" you born in mexico? the did in the first example refers to the personal act. Just my opinion. not a teacher.

Well,l guess it’s not a verb here, it’s an adjective that’s why you gotta use were instead of did.