Say we want to manufacturer some item, say cellphones, in the US. Start out with a small tariff on imported phones of 5%, then announce a schedule of slowly rai

Say we want to manufacturer some item, say cellphones, in the US. Start out with a small tariff on imported phones of 5%, then announce a schedule of slowly raising tariffs until phones manufactured in the US are cheaper than imported phones. Add a definition of manufactured in the US that includes something about the percentage of parts that must be manufactured here to prevent companies form only assembling them here. For phones if there was a profit motive, I think it would take somewhere around 5 years. Repeat for any item for which we want to ensure a domestic manufacturing base.