What do we really have left to subcontract? We have lost most of the jobs that made the US a great country. Today, our biggest industry is Advertisements. The bulk of the Internet is being treated as a large stocked fish tank. It used to be TV with their commercials, than the commercials went on to the actual show in the bottom 3rd of the screen. As people have made a transition from TV to the Internet the bulk of the advertising, or trolling for suckers has gone to the Internet and the Smart Phones.
The Internet is our big industry today.
We may still design technology in the US, but it is manufactured and produced in other countries, and it comes back to us as Imports.
The next biggest industry in the US is healthcare. From the insurance companies to the drug companies, and the health facilities. Sick, soon to be sick and dying people are their prey.
The US is being manipulated by Super Global Monopolies that make their big money here, but operate outside of the country. They use their profits to play the US as if it were a big game of monopoly, and they have all the hotels.
If you want to work at one of the US jobs that we had several decades ago, you will have to go outside the country and work at less than our minimum wage.
So I don't understand the question, what do we have left to subcontract?