From my POV there's no ethical reason to keep people who want to do work away from people who want to hire them. International trade and employment works against war, it's a net positive. If someone in Mexico wants to come here and pick lettuce, great. US citizens certainly don't seem to want to do it.

The key to peace is to make everyone rich. Make the whole world rich. Export the US meta on company building, on skill building, on design and investment and all that. Also export our hard learned lessons on regulatory capture and taxation failure so other countries don't fall for what we've fallen for and let mega corps get by with paying no taxes for years on end.