USA doesn’t control the source of the problem, which are random-ass civil wars that occur in Central America or South America.
What we do control are the legal limits of accepting immigrants. But remember that while the jobs market can likely accept more bodies, our housing market doesn’t have enough housing for a population boom.
Immigration law exists so that we can better plan jobs/housing/etc. etc. it’s a good thing in the abstract to control, no matter how sad the stories are of the people we turn away.
That being said: I’m overall supportive of more immigrants in this economy. Jobs are a major factor and it’s really 'Just Housing’s that’s a practical consideration. If we can get Congress + States to pass housing starts laws, then we can absolutely accept more immigrants in a way that’d benefit our country.