There’s a ton more nuance to this and it’s nuance Trump would never be able to comprehend.
But speaking of tariffs and corn and illegal immigration, NAFTA and US corn subsidies put something like 7 million Mexicans out of work in the 90s and started a huge wave of illegal immigration. I don’t know what’s happened since then but it’s better to stop something like that from happening than to do tariffs 20-30 years too late when all of your ability to produce something has already gone down the s#!tter.
But I imagine growing more corn is a lot easier than bringing back steel manufacturing, or whatever (I don't even know if that’s a good example but farming must be one of the easier things to bring back). Also, Mexico has cheaper labor.
The time to prevent US companies from having their goods made in cheap labor countries was the 1980s and 90s. That’s when tariffs would have helped keep things here. It’s a similar philosophy to adding a new customer vs. keeping an old one. Bringing manufacturing back is going to be a years/decades long venture if it happens, and the goods will continue to be expensive because the labor in the US isn’t cheap like it is in Mexico and China. It should have been stopped before people started getting all of their cheap crap from Walmart.