Auto tariffs have kept Detroit producing automobiles despite various other entrants, while still being low enough for foreign competition.
_Just about_. After significant government bailouts.
Ultimately, this sort of protectionism tends to be expensive, and yield an inferior product.
Auto tariffs are currently keeping far less expensive - yet much more advanced - Chinese EVs out of the US market, costing American consumers thousands of dollars on every car purchase.
At significant loss to the consumer. Sure a tariff can benefit a subset of people, by costing others even more.
We could also do this without tariffs by simply taking money from some group and handing it to another.