"I seriously doubt you "are going to move to another country as an undocumented immigrant unless you are moved to desperation by political or economic circumstances."

This is an assumption, and you could be right, but it's still just an assumption.  I respect your view, but disagree.  

Caring about the poor in other countries does not require that we take them all in.  Nothing says we can't do what's best for America --- it's clear we must do that --- while also doing what we can to help the poor of other nations, as Jesus would have us do.  It's clear we must do that too.  But a borderless America is not the solution.