Someone is always left holding the bag. If the USA uses it as a reserve currency, wouldnt others, too? Do you understand where this is going? Trust isnt lost instantaneously.
If others are holding it then they will also likely be mining it, if only to defend against a 51% attack.
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I guess it depends on how organized the governments are. I guess its not a race for nuclearization, it would be a race for bitcoin mining.
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