What is the national currency of Grenada?
The official currency of Grenada is the East Caribbean Dollar. The US Dollar is widely accepted (although probably not by taxis, small shops, etc) but you should expect your change to be given back in East Caribbean Dollar.
AS a member of The Commonwealth of Nations, Grenada uses The British National Anthem (God Save The Queen) and the native anthem Hail Grenada. Grenada's national anthem has 10 lines. It does not have a name, it is just called the national anthem of Grenada. Some of the words include God, heritage, unity and destiny.
I am not sure what you want to know. Before independence, British currency was used in all the colonies and was the national currency. After independence, the continental congress coined money which was a national currency. People did not fully trust the new currency and British currency was used as well.