That was part of the original tax ideas of duties and imposts. It balances their cost of production with ours. And if a duty is high, somebody here will work to produce a domestic made version. Thus putting people to work.
But the multinationals have convinced everybody it's a "global economy".
Not for our benefit. Multinationals have no allegiance to any particular country.
It is a global economy. To deny it means the death of creativity and technological advances in our country. Isolationism means making our dollars less valuable and giving us fewer choices of products. I digress from the subject....My apologies.
The single biggest reason for manufacturers leaving this nation is the tax monster we have created today (Lump all government interference into that...) and the quickest way to heal the wound that is cutting our throats is to kill the monster.