[skybrian]

Immigrants increase both labor supply (by working) and demand (by buying things). People often forget the demand part.

Businesses in an area that was losing population can benefit from immigrants moving in. A shrinking community isn't good for business.

[dssd]

Will you explain why these exact things have only had precisely the opposite effects in practice?

Seems like flawed theory to me.

Considering immigrants (as well as most low-wage Americans) primarily purchase cheap imported goods, the only jobs we appear to be creating by this method are extreme low-wage jobs, just like I said. Any other revenue goes to very wealthy who stash it or invest in capital or property, which makes it harder for most Americans to own a home.