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Technically, avalanche is a US coin. It was also the first proof of stake crypto currency but I have not seen it picking up much traction in the US. https://www.avalabs.org

*EDIT Avalanche was not the first proof of state crypto currency.

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Avalanche is not the first PoS coin. You could make an argument that the first was Tezos but there are PoS like instruments that predate it significantly.

Looks like Peercoin predates Tezos by about six years (2012 vs 2018):

https://en.wikipedia.org/wiki/Peercoin

https://en.wikipedia.org/wiki/Tezos

AFAIK peercoin is recognized as the first PoS cryptocurrency.

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