The US situation is more nuanced than you're framing it as. Even in Mexico there's largely negative sentiment against illegal immigration, as they also suffer from it with the caravans composed primarily of large numbers of young unattached males from a mish mash of places in South America pass through Mexico. They don't tend to leave happiness in their wake. The majority of Mexicans (55%) want them forcibly deported with a slightly smaller majority (51%) of supporting using the National Guard to carry out and enforce such deportations. [1]
Nobody knows exactly how many have come over, but there are estimated to be around 15 million illegal immigrants in the US, primarily via the southern border. For scale, the largest city in the US is NYC with about 8.5 million people. The 10th largest is Fort Worth, Texas with about 1 million. And that's after multiple waves of amnesty legalized millions more, which obviously did nothing but further incentivize more illegal immigration, exactly as in Spain.
So the question becomes, since Mexico is really really huge, why doesn’t the Mexican governemt do anything about these caravans? Not to mention that Mexico is pretty narrow at its southern end.
The border between Mexico and Guatemala is more than 500 miles long. Another issue is think about what's involved in stopping a thousand young males, plenty of them ready to fight. The reason these groups come in 'caravans' is because it makes it difficult to stop them without resorting to inhumane actions. And a thousand is fairly small relative to the size some of them reach. Another issue is money. Imagine you spend "only" $1000 per deported illegal immigrant, and in reality it's probably going to be substantially, if not magnitudes, more after all costs are accounted for. That'd already be tens of billions of dollars given that you're speaking of a problem on the scale of tens of millions.
> The reason these groups come in 'caravans' is because it makes it difficult to stop them without resorting to inhumane actions.
There is nothing inhumane shooting at people trying to illegally cross your borders. You can mine the forest there, build some fences with sensors and stuff. Solutions exist, my question is why no one is implementing them?
Nobody knows exactly how many have come over, but there are estimated to be around 15 million illegal immigrants in the US, primarily via the southern border. For scale, the largest city in the US is NYC with about 8.5 million people. The 10th largest is Fort Worth, Texas with about 1 million. And that's after multiple waves of amnesty legalized millions more, which obviously did nothing but further incentivize more illegal immigration, exactly as in Spain.
[1] - https://www.washingtonpost.com/world/the_americas/unauthoriz...
[1] - https://archive.is/KruVX