The US became the world's foremost industrial power at the end of the 19th century behind high tariff barriers.
Those barriers didn't seem to keep us all working on the farm.
The US has enough of its own natural resources and a large enough internal market to have free trade internally: we only truly need foreign trade for what we can't make ourselves, not so business owners can make short-term profits by forcing wages down to Third World levels.
If we follow the course of "free trade", we'll get Third World living conditions and --more importantly-- Third World politics here.
The idea that we should just “make everything here” is totally preposterous and laughable. You do realize our companies want to SELL their products worldwide? Our economy would collapse if we lost all our international markets. The idea that you don’t WANT to interact with the rest of the world, learn from its people and access its resources is truly myopic and sad.