The tariffs do the very opposite of encouraging manufacturing in the USA. It means anybody building stuff here suffers import tariffs on materials and equipment, and then they suffer retaliatory tariffs when shipping their goods internationally. They can't compete under those circumstances with other maker in countries which neither occur.
Any new investment in manufacturing will be where tariffs are low both import and export, and the government policy is stable and knowable. This is not the USA and won't be for at least this presidential term, if not longer.
My USA based business is actively looking for a non USA site to do our production and fulfillment. We cannot buy parts and have them shipped to the USA, just about anywhere else in the world is better. If I don't find that, I will have to lay off some of my employees since we won't be globally competitive with our products.
Those who think tariffs will bring back American manufacturing jobs are delusional and don't understand supply and distribution at all. Unfortunately, their delusion is now USA policy, so it will take an economic disaster to expose this fallacy. Even then, those who defend the current policy will steadfastly believe it is the right thing since the initial delusion will expand to dismiss the obvious negative consequences. We have more potential to bring back the horse and buggy than making the USA a self sufficient manufacturing country again.
The trillions of cumulative choices of the American consumer have decided where our products will be built, and it isn't predominately in the USA.
As we cut ourselves off from our allies and our supply chains, the rest of the world will adapt and carry on without us. They will be just fine after a relatively small period of adaption. We will not.
Decades from now, the history books will describe this time as one of great change, when the USA substantially decreased in global relevance and entered a period of economic hardship.
Mike C.