That being said, I would presume that "nowhere in the world" and "never in the history of mankind" are unlikely useful for this purpose, but for "freedom of speech" sake... you are the master of your keyboard.
Bitcoin would not be improved by being made legal tender anywhere in the world, and nowhere would do it.
I don't see how it could "improve bitcoin" either. What I am talking about is it's status as defined by the law.
"Nowhere would do it" because of [many many reasons.] However, some reasons do not apply to ALL countries, and therefore some countries have fewer reasons not to do it.
If I may rephrase: what is that universal reason that applies to all country that do and will ever exist, and makes you totally convinced that "nowhere" would do it?
In my eyes, a statement's weight is proportional to what supports it. What is behind your claim?