The rest of the world was already increasingly nervous about the way that the US dollar is a vehicle for soft power around the world, we're already seeing a lot of oil denominated in rubles, and now Trump is encouraging the growth of a shadow currency that will make it even easier for transactions to take place without dollars (notably, cryptocurrency will help America's ultra-rich evade even more taxes, and commit even more bribery):
https://www.programmablemutter.com/p/what-happens-when-economic-coercion
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