I'd wager it's a deliberate US state policy. It's because we indians are good immigrants - whether it be US, Europe or the middle-east, we tend to respect (even if we necessarily don't like) the local culture and laws and try to avoid trouble and be good citizens (often better than in our own country :). And the US is a country built by immigrants that needs people. That is why Indians today are one of the largest immigrant group in the US. Also, cheap labour. That's capitalism at work - why hire American when the whole world can be your HR pool?