His biggest crime/stupidity was opening up relations with Red China. Look at us now - no manufacturing left anywhere. He just made it easier for them to sell what they steal from us.
We manufacture more now than we ever have; we just don't use very many workers to do so. Labor-intensive manufacturing of low-tech, inexpensive products has to be done where labor is cheaply available. Anyone who bemoans the loss of, for example, textile-industry jobs in the U.S. never had one.