Manufacturing is already here. US's manufacturing output is higher every year. Manufacturing jobs don't exist, and therefore cannot "come back". There is no scenario where Americans go to work in some kind of electronics or textiles sweatshop. If the result of these tariffs is "more US manufacturing" then all of that manufacturing will be automated and robotic.
Who said anything about sweatshops? You pay the minimum wage expected by law. Apple has $180bn in profits. They could surely afford to pay US workers and lose some of that profit. But everything has been dominated by greed these days.