1) Where do you derive the data about "largely good opportunities at home"? Also, what does caste have to do with anything? The actual economic opportunity, quality of education, etc. is what should be compared.
2) Even in the less-dysfunctional countries like India or Russia, an average person makes much less money and receives far less assistance from the state than an average US poor, especially as far as "opportunities" go. Look up the numbers; for a nice example my family made less money per year than the yearly govt spending on an average public school student in the US.
There are some types of poverty in the US that could be explained by bad luck, like being disabled, sure. The other ones using hardship as an excuse just make me laugh.
Like, as far as I recall, Nigerian Americans are one of the best educated immigrant groups, far above US-born whites. You cannot seriously claim they face less racism than US-born African-Americans, or that they experienced less hardship in Nigeria; on top of that they also have the difficulties that immigrants face. Sure, they may self-select - but that's exactly my point - any advantage these self-selecting individuals have, they deserve - probably twice over.
Most American poor are vastly more "privileged" (I don't like the word, but it fits) than almost anyone else in the world. But they waste the opportunity, for whatever reason.
