Most countries in the world are begging for more people, given aging demographics. Few places are allowing that to translate into more liberal immigration policies. Japan and SK, OTOH, are now forced by need to find some way to make migrants palatable to their ethnocentric societies. Across the West, birth rates are down, in most places below the replacement level.
In the case of the US, immigration is from among nations largely friendly to it, and culturally similar enough, such that there is a great degree of assimilation by the third generation. Economic growth is enhanced by a rising population base. The US has it made in this regard. Much better off than many competing nations.
So, yes to immigrants, and to arranging for their status to become legal. Which means administrative and civil laws may be broken, but there is no criminal outbreak as the racist Right claims. Crime is much worse in Red states by any account, where the presence of immigrants is less.
It is not only legal, as others have pointed out, for states not to enforce federal law, but treating the influx of immigrants as a positive thing is logical and in their self-interest. Yes to sanctuary cities, and no to their need to ask permission of the intolerant.
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Aside: Real question is, should the intolerant be tolerated? Why recognize anyone as a rights-holding person who, e.g., all the while arbitrarily denies that same recognition to others using dehumanizing calumny and degrading lies? (Trump, Netanyahu) This form of the democracy paradox is best resolved by identifying such speech as hate speech, and legally exempting it from protection under the right to free speech.