In parent's example, the overall wages didn't drop because the immigrants bought stuff in a small geographic area, so more shops opened to sell stuff, and more warehouses were needed to store stuff, etc...and those new jobs were filled by the immigrants. I'm not disagreeing with that. My point is that this isn't how it works when the pool of people is all highly skilled individuals scattered around the country. They end up just working for cheaper than an equally qualified American citizen, driving wages down and competition up.

If you have data to support that assertion, I'd love to see it. Otherwise it's just unsupported speculation that I believe is incorrect.