Yeah. Because we didn't have any immigration quota whatever back then. We've stupidly held it low for decades, and now we're paying the price.
We wouldn't be having this lovely conversation if the same were true for the lion's share of the these people flying Mexican flags.
And they'd be flying american flags, if we didn't keep reminding them that they're illegal and don't belong here. We've created the problem, and talking about shipping them to mexico (where many of these kids have never been to that they can remember) won't make them feel warm and snuggly to the USA.