Yes, but he came through Mexico to get here. And the Mexican government overlooked him or didn’t catch him even thought THEIR illegal immigration laws are an order of magnitude harsher than ours. As far as I’m concerned, they are all from Mexico.
I would not doubt that Mexico facilitates their journey to the U.S. to get them out of Mexico ASAP. After all the pinche gringos are rich let them solve all the problems.