Texas is planning to make a huge public investment in space

"Further investment will cement Texas as the preeminent location for innovation."

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[Urist]

Boca Chica, SpaceX. How much say or influence does Mexico have on SpaceX operations, launches and risk of RUDs?
Currently at work, so can't do a lot of research into this, this will have to wait till later.
If Texas wants to invest more into space launch initiatives, can the Mexican government interfere?

I'm guessing that the Mexican government has absolutely no say in what happens in American airspace. They might prevent any southerly launches from Boca Chica that would pass into Mexican airspace or waters, but I doubt that SpaceX would want or be authorized by the FAA to do that anyway.