Mexamerica can't be far behind.
I'd be willing to give Mexico Southern California, Arizona and New Mexico for them to set up their nasty Aztlan nation. On the condition that all Mexican and other south-of-the-border illegal aliens in the rest of America move there immediately.
I'd even be so kind as to offer a small window of opportunity for the American citizens now living in the ceded states to repatriate to the US. After the window closes, though, they become Mexicans or Aztlanians or whatever.