The Past Speaks

I’m reposting a recent and very interesting blog post by Bryan Caplan,

Argentina officially has near-open borders.  At least on paper, you only need an employer or family member to sponsor you.  The country isn’t as quite First World, but with per-capita GDP around $15,000, Argentina would be a huge step up for most of the workers of the world.
Question: How hard would it be to set up a cost-effective charity to help sponsor the global poor for immigration to Argentina?  Responses from GiveWell, the broader Effective Altruism community, and Argentina experts are especially welcome.