Sweden and Germany, just to give two examples, which have no immigration limits and refuse to set any.  And just look at all the social upheaval and economic costs that heavy migration into those nations in recent years, along with the inability and/or unwillingness of many of those migrants to assimilate or adapt to the prevailing culture, has resulted in.

I am not anti-immigrant, but there is a distinction between controlled immigration and wholesale and unlimited migration.  The historical record is clear on the detrimental and often disastrous results of the latter.