Just because there is a Dr shortage in the US due to having a limited number of medical schools, there are still thousands of students who get their degree and can't find a residency:

>.... The matching challenge comes as the U.S. faces a physician shortage. The nation could be short as many as 139,000 physicians by 2033, according to the Times, which cites Association of American Medical Colleges data. Despite this shortage, thousands of medical school graduates are consistently rejected from residency experience, rendering their MD or DO "virtually useless," according to the report.

https://www.beckershospitalreview.com/hospital-physician-rel...