US does produce olive oil, particularly in states like California, Arizona, Texas, Georgia, Florida, Oregon, and Hawaii. So you do have a few options:
1. Support local producers. There are high-quality olive oils made right here in the US that might surprise you.
2. Work with Tunisia manufacturers to move their production to the US
3. If you don't want to support local producers, pay extra and enjoy your Tunisia olive oil as much as you want
4. If politics is the real issue for you, move to Tunisia, there is no "orange man" there
That said, refusing to support local production out of principle isn’t really a solution.You forgot about
5. Switch to another source of fat, like lard or butter.
Even if there isn't a local industry that produces something, tariffs increase the competitiveness of domestic substitute goods.
US consumption of olive oil is more than 10x domestic production of olive oil. It is not possible to spin up olive orchards in even a medium timespan as the trees take many years to grow. It’s not about wanting to support domestic producers, it legitimately is not possible.
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Difficult to move the production of olive oil.
I don't know how much you know about olive oil, but it comes from olives, which grow on olive trees. Olive trees are famously long-lived and, together with the very specific types of land that they grow on, they represent extremely persistent and valuable investments for the people who produce olive oil.