I'd be happy if they'd just let us keep what we won, bought and paid for after the Mexican War.
As a lifelong resident of the great state of California, uh, no. I’ve been to Mexico dozens of times, and for all its faults, I’ll take California over anywhere in Mexico all day every day. That said, Mexico doesn’t have the wherewithal to properly develop Baja California, and it’s a massive waste. It would be easy to defend the border of Baja against the rest of Mexico, there’s just a sliver along the Colorado River between Arizona and the Sea of Cortez. But there’s also 2000 miles of subtropical coastline, maybe 100 of it has been developed. The rest is just wasteland.