I would not say it is slavery, my friends who are in US on H1B are very happy. They get to live in the US and save money.
Couple of my friends had the opportunity to go to Europe via their Indian Outsourcing company but they cajoled/begged to be sent to the US.
Integrating into US is easier since most skilled immigrants are good with English. Personally speaking language was was one of the important criteria when I made the decision to move to Australia from India.