memes

This isn't all that true. For many blue collar jobs, at least.

It's very hard to be a roofing company and stay in business without using immigrants in many area, for example. No one in the US will work for less money than the immigrants who are mostly sending money back down to Mexico. Everyone wants to pay as low a price that they can for their roof job. Not using immigrants means you have to charge a higher price. That loses you work because you're constantly underbid. You either use immigrants, or you struggle to keep the business and employees going.

I worked blue collar for quite a few years around new construction homes. I've literally watched this go down and making an Office meme doesn't make it less true. In a perfect world it wouldn't happen and no one would hire immigrants and pay them less money, but we don't live in that world, so once a few people start doing it the option often becomes "Do it as well, or go out of business"