A common misperception is that US manufacturing has been declining only since the 1980s, when we allowed the evil Japs to sell us their cars and cameras. In fact, US manufacturing has been in decline for more than 60 years.
You want evidence? New England residents can see the hundreds of mill towns that used to line the rivers throughout the region. Connecticut residents can visit armpits like Bridgeport and Waterbury. These places didn't decline due to foreign trade, they declined due to changing demand, new technologies, and companies/employees/local governments refusing to embrace reality.
Some of these New England mill towns are fortunate enough to exist in scenic settings and have been rescued by monied residents of Boston and New York. The rest of these towns are dead or will be soon. See Berlin, NH for an example.
We still manufacture stuff in this country. To succeed on a large scale again we need to dump the rigid, counterproductive union work rules and strive for better employee/employer relations. Companies dumping their medical insurance liabilities on the Federal government will also help manufacturing.