Migration is to evolution as breathing (respiration or transpiration) is to life. Everything has existed in something else for that life’s existence. An, then there was birth.
Immigration is simply a milestone in migration. Migration has always existed. Likewise, immigration always existed, and always will. Trust me on this one: Animals copulate. Animals migrate. Or, they die.
If you oppose immigration, you are simply opposing life. “Hello!” You get better odd playing the Super-duper lotto. Good luck with that!
The answer is “one.”