I don't understand why companies are still trying to bring people in the US to work for them. What's the point for the employer? How about investing overseas an

I don't understand why companies are still trying to bring people in the US to work for them. What's the point for the employer? How about investing overseas and training people here to handle remote offices? That's where we failed in the past... because it was too hard to manage and would require spending extra money to fix the mess. So we all decided to bring everyone in-house which is obviously a much bigger issue. I think we should invest more time in building infrastructures in other countries in order to create top of the line working places outside of the US. This would probably end up costing less and would help hiring way more people. Again, create new positions in the US like a "Remote Office Manager" and build kick ass campuses in India, China, Europe, etc. The whole immigration thing would be totally obsolete... I mean, we will be able to travel to Mars soon... why can't we even manage remote employees in 2017?