I think part of the problem with US adoption is that the government has made purchasing, trading, and owning crypto unnecessarily complicated. I live in NY and the restrictions here are absurd. We have access to two exchanges and that's it. I cannot even use my localbitcoins account anymore. A few years ago I would sell crypto to people all around my area in person and meet and discuss crypto as well. On top of that I think mainstream financial media has been consistently snubbing bitcoin until just recently because it was seen as a competitor to more traditional investments. I think in general America has been having a lot of trouble maintaining itself as a modern country.