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How to invest for the event of a US default? 
Lots of opportunities during threats to US debt demand. Most just involve being short the S&P or long the VIX (or short treasury bond futures, or short a US dollar currency pair). Those are the opportunities. And if you are worried about the utility of speculating in US dollars on a decline of the US dollar, then it is easy enough to hop out of the FEDwire network into a cryptocurrency network these days - either as a value transfer protocol to another currency in lieu of capital controls, or a speculative investment, or both. Enjoy!