From my (USA American) viewpoint, caste discrimination seems very close to discrimination based on national (or group, e.g., Roma) origin. I would not be surpri

From my (USA American) viewpoint, caste discrimination seems very close to discrimination based on national (or group, e.g., Roma) origin. I would not be surprised (but do not know) were some instances of caste separation historically based on national origin. How does caste discrimination differ from discrimination due to national origin (other than the fact that it obviously does not go away after multiple generations b/c inter-caste marriage is taboo)?