Instead, you would use signs to describe the concept:
* "Mexico": Sign for "Mexico" (M shape on chin, then move hand outward)
* "Person from": Sign for "from" (index finger pointing away)
* "Country": Sign for "country" (C shape, moving in a circle)
So, you could sign "Mexico" followed by "person from" and "country" to convey "Mexican."
Important Note: Sign language is a visual language and specific signs can vary based on regional dialects and individual signers. It's always best to learn from a qualified ASL instructor.