One could probably extrapolate from the statistic mentioned in the article (below). It seems plausible that the US visa system ends up taking in more people of high castes.
>In 2003, only 1.5 percent of Indian immigrants in the United States were Dalits or members of lower castes, according to the Center for the Advanced Study of India at the University of Pennsylvania. More than 90 percent were from high or dominant castes. About 2.5 million people of Indian descent live in the country, including those born here.
>In 2003, only 1.5 percent of Indian immigrants in the United States were Dalits or members of lower castes, according to the Center for the Advanced Study of India at the University of Pennsylvania. More than 90 percent were from high or dominant castes. About 2.5 million people of Indian descent live in the country, including those born here.