Check My Live Alexa State Page:
The confusing part is how they are deciding the country to show. In my exploration i find out its showing the country where that specific site have better rank. Like for Asif2BD.info, it has Alexa rank of 750 in Bangladesh so its showing Bangladesh. But when i was exploring more i find out, its showing USA for facebook, where FaceBook.com have Rank 3 in USA, but Facebook has rank 1 in Bangladesh, but its still showing USA as showing country, so it seems its consider origin country too, like where its owner information or where is its server.