>It's not like undocumented immigrants even get welfare or other social programs

False. Medicaid is US state-subsidized health insurance, which undocumented immigrants are eligible for:

"Children (0–18 years old) can get full Medi-Cal coverage, no matter their immigration status. Adults (19 and older) are currently eligible for full Medi-Cal coverage, regardless of immigration status. Starting on January 1, 2026, adults who do not have Satisfactory Immigration Status (SIS) will no longer be able to enroll in full Medi-Cal. If you already have coverage, you can keep it; just make sure to renew your coverage during your renewal month."

https://www.dhcs.ca.gov/medi-cal-immigrant-eligibility-faqs/

(Medi-Cal is the California version of Medicaid)

>For example, many of these people flee countries that have dire situations directly caused by US interventions over the past decades including most of Central and South America.

Not everything is the fault of the USA.

Chile, one of the most famous examples of American intervention, is now one of the wealthiest countries in Latam: https://ourworldindata.org/grapher/daily-mean-income?mapSele...

Polls showed most Panamanians approved of Operation Just Cause. You can see after the operation in 1989, Panama's median income started ticking upwards: https://ourworldindata.org/grapher/daily-mean-income?tab=lin...

And when the US intervened in Venezuela recently, Venezuelans were dancing on the streets.

As an isolationist, I'm against American interventions. Our track record is mixed at best. But the idea that every world problem, or every South American problem, can be blamed on the US somehow is a vast oversimplification.