Especially for folks like you who have scant knowledge of history. Ever hear of Fordney-McCumber? Coolidge was also a huge tariff guy along with most Republicans prior to the 1990's.
There were also Congressional controls over tariffs that are no longer obeyed. Has it been 120 days? And has Congress affirmed his tariffs? Presidential authority in this matter is very limited. It is the job of Congress.
And while it doesn't matter now vs then (the math is still the same), the impact is far more grievous now, and 10x more noticeable. Coolidge was around when we were barely getting out of steam. International trade had nowhere near the impact and affordability it has today. So in that day, we were our own market, by and large, which is not as true today.
If you want steel mills, the better way is to get rid of burdensome regulations that are causing American companies to be noncompetitive in their own market, and of course, Gary Indiana will have to have a sit down and figure out whether their union wages and pensions are worth the layoff.
Do it better and cheaper. I am not afraid of that.