I think its more complex than this. For sure H1Bs push down wages for certain positions in certain circumstances, but also it does also fill a skills shortage.

I think its more complex than this. For sure H1Bs push down wages for certain positions in certain circumstances, but also it does also fill a skills shortage. There are some skills which no amount of offering higher pay will fix, you need to bring in the actual people with those skills. And when USA gets those people, that can make companies thrive and expand which then improves employment for Americans and pushes up wages for certain positions which helps Americans. I think its pretty hard to disentangle what the effect is really.