As hyperspecialization of the workforce increases, the availability of jobs to U.S. workers in non-technical fields shrinks as a result of market unprofitability. Part of the reason late-born GenXers and Millennials have seen such difficulty in finding stable careers is due in large part to this economic paradigm shift.
In 1955, it was profitable for many companies (and government agencies) to have in-house hired landscapers, custodians, building security, file clerks, administrative/support staff, communications and marketing staff and numerous other positions. In 2015, most offices have replaced these unprofitable positions with outsourced third-party contractors, consultants or even computers.
It is only natural to expect the modern U.S. market to respond to these conditions by manufacturing products that require minimal cost (such as digital content and information products), re-locating industry to geographic locations where the cost of production is cheaper and shrinking demand for domestic labor.