The multinational drug gang Mara Salvatrucha dominates most of El Salvador, but it started in the US — a consequence of US repression in El Salvador.

Then the US deported the Salvadoreans, and they brought the gang home with them.

I don't think the US should admit large numbers of immigrants. The US birth rate is now low enough that the population (and thus the enormous ecological footprint) would decline, if not for immigration.

However, when it comes to refugees, the US would face a lot fewer requests for asylum if stopped messing up other countries.