Very interesting. But one of the problem is immigration. With open door policy that make USA great at the same time make the problem hard. But as long as it is hard to get there, the problem is not totally unsolved. Some sort of "control" is needed but not totally cut. That would be a universal problem as there would be rich-poor region forever. As said you can send people to the moon but never solve the problem of the poor. Not solved but should be handled. Could be handled. And even if not, we can try. But not unlimited immigration.