This will be interesting. Even a 10% tariff can be an effective motivator for suppliers to shift locations. But since all nations have that, it makes the choices easy. If the average cost + tariffs is less in the USA, then most would open a factory in the USA. Once you hit differentials in tariffs above the ten percent line, it gets harder. You still look at average total costs of production + the tariff rates. You would relocate your plant to either the USA or whatever nation would give the lowest average cost of production. The problems with the Trump policies for the ports etc. is most expect them to be transitory as the previous poster suggests. Until there is clarity there is likely to be shortages or far higher prices for most goods from Asia, which I assume is what the California ports handle the most. At 100% tariff levels it is so costly, that you might as well embargo goods from China because there is no way they are competitive in the long run at those tariff levels.
Today, Trump said that China will eat the tariff costs. This sounds great, but the reality is that most goods from China have low profit margins. They might take below cost prices for a very brief time, but China is shopping for other markets for many shipments already produced and they will adjust factory output to match the rest of the world minus what they previously sold to the USA.