No matter which way you slice it, there are just not going to be enough jobs for everyone in the future, and society needs to adapt to that.
No or low taxes on imports is sweetheart legislation? There is no way US labor prices (some of the highest in the world) were ever going to compete with the labor prices in developing countries where families live in a single room. Not to mention the lack of labor and environmental standards.
I am not aware of any US import taxes that were removed to allow this labor price arbitrage to occur. It was simply a fact of international shipping efficiencies making trade and the labor price arbitrage much easier.
We can bring back the manufacturing, but the jobs are highly unlikely to follow. Rather than 800 unionized workers working the assembly lines, it’s 8 robotics technicians overseeing the machines. This ratio will, obviously, vary depending upon exactly the product being manufactured.