This is all very theoretical in nature. In fact, I don't know of any U.S.-based company who successfully outsourced their whole operations to South America, Ind

This is all very theoretical in nature. In fact, I don't know of any U.S.-based company who successfully outsourced their whole operations to South America, India, or, as the comment above the one I am responding to proposed, Canada. Time zone is one reason. The other is about work culture, ways of culture, schools, the academic world, the media, the circle of friends that often overlaps with the circle of professional acquaintances, the expectations.