That is the central claim of my latest Bloomberg column, here is one excerpt:
State and local governments are making immigration policy all the time, mostly for the worse, and often Democrats are more restrictionist than Republicans.
Obviously the law can deter potential illegal migrants from entering the U.S. But so can the high cost of living. Even though there are much higher wages in the U.S. than in its neighbors to the South, a lot of those higher wages are eaten up by much higher rents — especially if the immigrant moves to a major city, as is often the case. I once wrote a book based on fieldwork in rural Mexico, and I found that, for those who had migrated temporarily to the U.S., high rent was typically their biggest complaint. It therefore follows that policies which raise rents tend to discourage immigrants, particularly poorer immigrants.
The minimum wage is another tool of anti-immigration policy, at least for less skilled immigrants. Say a city sets a minimum wage of $15 an hour. That means a potential migrant whose work is worth only $12 an hour won’t be able to get a legal job in that city. That will deter migration, both legal and illegal. Furthermore, a worker in, say, Honduras may not find it possible to improve his or her skills to be worth $15 an hour, at least not without arriving in the U.S.