Japan still remains as the largest bitcoin exchange market with over 51 percent of the market share, analysts stated that the crackdown on small exchanges have had an impact on the global cryptocurrency market
I think countries that fully accepted Bitcoin as a currencies or as legal tender are Japan and Germany. Most of the countries accept Bitcoin but as an investment not as a currency in which most of these countries are big and reputable like USA, Russia and Britain in which they can influence and attract other countries to accept Bitcoin too.