The West does not understand caste. Their only comparison is slavery which is completely irrelevant. The closest thing to caste in the West is class.
This is the British social classification experiment all over again where they came to India, invented criminal tribes and martial races, and took the fluid jati/varna system and froze everything as part of law instead of letting society deal with its problems at its own pace. The result is there for every one to see. Three hundred years later, politicians in India want a caste census to maintain their caste-based vote banks, and caste groups that used to rule entire kingdoms demand to be classified as backward castes because it helps them compete with other caste groups who are benefiting from reservations/affirmative action.
If the US legally recognizes caste, in 50 years time, you will see Indian politicians campaigning for votes on caste lines in California.