These courses are always mandatory, because no one would take them if they were voluntary. They’re always on diversity, never on assimilation.
Five years ago, the State of New Jersey made six hours of education in “cultural competency” (their term for diversity) mandatory for relicensure for all physicians. I took the course in two boring sessions with a roomful of doctors from India, Pakistan, Egypt, Syria, China, the Philippines, Nigeria, Cuba, Russia, Poland, and so on. You couldn’t imagine a more diverse (and, by the way, assimilated) group being lectured on diversity.