By Europe you are excluding Russia right? Mexican/Latin American wealth is correlated to skin color like it is in the USA, so most of the illegal border crossings are from those with darker skin, not just the “average Mexican.”
I’m not excluding Russians. They make up a vanishingly small percentage of DACA recipients, for example: https://www.uscis.gov/sites/default/files/document/data/daca.... I don’t know where folks got this idea that there were tons of europeans overstaying their visas. Visa overstays are a route for Asian and African illegal immigrants. And however you slice it, those folks are going to be darker, on average, than the folks coming over illegally from latin america.
This whole narrative is silly. The government is prioritizing stopping the flow of poor people more than people who can afford a plane ticket. Obviously.
DACA are just dreamers, by that measure most DACA holders are probably South Korean (left over from babies who came here in the 80s and early 90s, and can’t go back because to South Korea of harsh conscription rules). I’m not sure what you think DACA has to do with real illegal immigration (actual adults coming to the USA and overstaying their visas, not just babies).