There is an economic rule about this
Basically what it says is that new developments - like electricity, cars, computers - cause a temporary increase in demand for labor - and therefore higher wages.
As the technology becomes routine, optimization and automation remove the need for labor - demand for labor decreases and by the rule of the market wages go down.
This development is natural and has nothing to do with who's currently president, policies or anything like that. To quote from the link above:
Stephen Cullenberg stated that the TRPF (Tendency of the rate of profit to fall) "remains one of the most important and highly debated issues of all of economics" because it raises "the fundamental question of whether, as capitalism grows, this very process of growth will undermine its conditions of existence and thereby engender periodic or secular crises."
The only thing that guarantees that the population in the US can continue to live in the long-term is Universal Basic Income - which says that the state should distribute resources among the population even if the people don't work. Basically a form of state-backed social welfare. Without it, the issue will continue to get worse, until people will die on the streets by hunger and cold in masses. UBI is a necessity for the person and for peace.