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They NSA will trace it and have nearly perfect insight, something they can't do with ships full of oil or gold.

Then when China or Iran then sends it to ActBlue or whatever in the US to fuck with domestic affairs, they have a full chain of evidence to deal with the domestic actors.

Every Iran headline is fake, but let's assume they did take Bitcoin for tolls (they can only do this with US approval anyway given our Navy), that would be great for the US... because the US can then watch where those sats end up. They don't even need to go through the hassle of installing CIA operatives at Barclays, Sberbank, or Credit Suisse.

The US already wants to pressure miners

Not sure to what you're referring, but export controls on Bitcoin would be exceptionally bullish. Keeping the US financially dominant enhances national security.

the US wants Iran to use bitcoin for international trade

The US wants everyone to use Bitcoin for international trade, and end the Triffin Dilemma.