Immigration policy is one of the most important areas of global development, as an open borders regime would dramatically reduce poverty and grow the world economy by up to 150%. Open Phil devotes some funding to immigration policy in the United States; however, the Trump Administration has been extremely hostile to immigration, and it seems wise to spread our effort across several countries in order to loosen immigration policy around the globe. Which countries would be the best places to advocate for more permissive immigration policy?
Interesting question! Before identifying countries in which to advocate, I think we'd need to
1. More precisely define what the goals are -> I'd infer from your post that you see poverty reduction as the main goal; other considerations could be to reduce suffering caused by family separation, exploitation of irregular migrants, or inequality, for example;
2. Identify the factors that we'd use to determine which countries would be the best places to advocate for more permissive immigration policy -> the importance, tractability, neglectedness framework is a useful starting point but would need to be fleshed out;
3. Use the above factors to assess which countries would be the best places in which to advocate for more permissive immigration policy;
4. Assess whether the impact of dedicating time and money to this cause outweighs the impact of putting the time and money into something else.
I don't have time right now to flesh out the analysis but would be very interested in hearing others' thoughts!