There are no overseas communities of majority Indian subcontinental origin that maintain rigid caste distinctions. Not even Mauritius which is majority ethnic Indian or Fiji or Guyana where they’re about half the population. Caste will not be maintained in America for the same reason no ethnic group maintains itself without religious endogamy or continuing immigration; People socialize and mate with those they spend time with unless there are powerful reasons not to. All will be assimilated in time.
Look at northern inland there are places in Ireland and parts of Scotland and even the USA where I would have to be careful as I am a product of a mixed marriage and I also was a a "crown servant for 15 years" and have a southern ie catholic last Name.
Ironically, it is breaking down in India because of female infanticide creating a skewed gender distribution (around 1.14:1, when the natural distribution is 1.05:1), and men having no choice but to look outside their caste if they want to marry.
I doubt if the average English person today is really even consciously aware of the Anglo-Normans being higher class. Certainly there's no easily visible divide or overt discrimination in modern times. Yet the legacy of the caste system left by William the Conqueror continues to shape society a thousand years later.
[1] https://www.telegraph.co.uk/news/newstopics/howaboutthat/842...
As a low caste Hindu who grew up in India, it is not at all shocking to me. In-fact Dr.Ambedkar, the lead author of Indian Constitution, wrote "If Hindus migrate to other regions on earth, Indian caste would become a world problem."[1] and he is proven right.
The reason Indians continue the caste system wherever they go is because, it is ingrained in the Hindu religion. Caste system and the religion are inseparable. Ambedkar realized that it is impossible to get out of the clutches of the caste system as long as one is Hindu. Hence he said “I had the misfortune of being born with the stigma of an Untouchable. However, it is not my fault; but I will not die a Hindu, for this is in my power.”[2] and he converted to Buddhism.
1. http://www.columbia.edu/itc/mealac/pritchett/00ambedkar/txt_...
Is it so shocking though? The US has its own sordid history of caste-like discrimination in work, civic, and personal life, as the African American community can attest to. Huge portions of the US had anti-miscegenation laws on the books up until 50 ago [1]
If anything, many of the patterns of discrimination in the US line up quite nicely with those that arrived with some (though not all) Indian immigrants.
This has frequently resulted in a stark schism between the older generation of Indian immigrants, many of whom readily adopted the US' racist attitudes toward African Americans, Mexicans, etc, and their American children, who often have nearly the opposite perspective.
1. https://en.wikipedia.org/wiki/Anti-miscegenation_laws_in_the...