As of 2018, just under 30% of USA physicians and surgeons were foreign born.
Ted Kennedy's 1965 immigration bill allows UNLIMITED immigration by foreign MDs.
I have not seen an inflation adjusted income analysis of USA physician income in recent years, but it would not surprise me if it has stagnated or declined, exactly like incomes for other occupations that have a massive over supply of foreign labor.
The global capitalism is a failure. It does not help the average citizen at all. This why the Democrats are gaining power daily by selling socialism as cure to global capitalism. Both sides are wrong.