What does Economic Isolationism look like for America?

Let me preface this by saying that this is a sincere question. I can fully understand why this would sound great to the people of America. I was just thinking though, if all the manufacturing jobs came back, wouldn't the minimum wage have to go way down to keep the product prices at there current state? And wouldn't this be bad for large Businesses like Apple and Tesla, as so much of there Manufacturing relies on the extremely low wages of the countries that produce their components? And wouldn't it be devastating to America if there was a tarrif war with China? The whole thing really confuses me.