Well, as far as I know the first country legalized the bitcoin was japan because japan is open for innovation and they thought bitcoin will help them to their economy. And based on what I read recently, In the mall of japan they started to accept bitcoin as a payment. And when japan accepted bitcoin china, switzerland, russia and some country followed it. But I thought cryptocurrency has a limited bitcoin transaction in china (I only read that in other section). However, its a great thing if many countries also accepted bitcoin.