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>> “Did you know that a mexican born here is a US citizen?” <<
Not so if his parents are not here under a visa. that requirement is a part of the 14th amendment. Must be here under the authority of the US Government for the kid to have citizenship.
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I am going to say this once to all the people who would like to believe this is correct--it isn't; it is pure wishful thinking.
The possibility exists that you get a Congress which might enact legislation under the jurisdiction clause of the 14th Amendment and you might also get a Supreme Court which might uphold something like that but those are unlikely prayed fors.
Absent a change in the legislative and judicial environment, the Supreme Court at presently constituted is going to hold that any person born in the geographical territory of the United States is a citizen.