The list of countries is quite large, but which country will actually do this? For some reason, I think that this will not happen soon.
^ It mentioned above, those countries that have a high inflation rate aginst dollar since BTC is backed on the dollar.
Most likely adoption and becomes legalization have come from a country that has a small community or even those from third-world countries.
Considering as a legal tender is very difficult and that is the reason, not all countries have decided about this. Because how can you force people to simplify paying tax since if they used crypto it is non-taxable. Nevertheless, let us better see and wait for what will happen next.