To those who favor limits on between-nation migration: why do we not hear more from you on within-nation migration? The cases aren't exactly alike, but are similar enough that those who often favor between limits should also favor within limits in many cases. What are those case?
There are significantly greater differences in culture and language internationally than intranationally. These differences create friction in any society, and without criteria, lead much more readily to neg negative benefit immigration i.e. foreign freeloaders who don't work.