I am not asking about Mexicans crossing the US border in either way. Instead, what would happen if an American decided he wanted to sneak across the border into Mexico? He is not a felon, just someone who wants to work in Mexico. Or, let us say, he wanted no part of Mexico and instead slipped into Belize by illegally crossing the borders and took a job in Belmopan? Would he be sent back to the US? Is Central America concerned about undocumented workers from the North?
Not that I would ever do this, but I do like warm climates and can tolerate rainy seasons.
I had a quick search about this, but unfortunately you can imagine the results I got placing “Mexico” or “Central America” and “immigration” in the same Google.
But I’m curious about this too, so rather than just a bump, I’ll speculate. Ostensibly at least, Mexico is certainly concerned about illegal immigration, though I doubt they target enforcement along the US border. Their southern border is likely the biggest problem - after all, they get enough hassle from the US on this issue as it is, the last thing they need is all sorts of people from anywhere in Latin America using them as an entry point to the USA.
They’re also concerned about their own country, so my feeling is that if you were unlucky enough to get caught, you would be deported. But I have no idea how likely you would be to get caught.
An american citizen just visiting a plant in Mexico has to obtain a temporary work visa, even just to observe the operations. I was told that there are steep penalties for companies who let people cross the border as tourist and then let them work. The companies on the mexican side of the border encourage the parent companies to employee mexican nationals in factory and technical positions when ever possible, as these are high paying prestiges positions in Mexico.
As someone who does this quite frequently, I can say that you can enter up to 30 days on this “visa.” Actually, it’s just the tourist card everyone fills out, but you check “business” as the reason for your trip. That’s it. For extended stays, you pay the $200 or so dollars and get an FM-2 document from the Mexican consulate. Looks like a light-green colored passport on the outside.
I do know at least one illegal US immigrant in Mexico, too! Because he’s a mean drunk, he gets locked up every now and again, but he’s never been deported. He does odd industrial jobs when he’s sober.