Ecuador adopted the U.S. dollar as its official currency in 2000, after a severe inflation crisis.
El Salvador adopted the U.S. dollar as its official currency in 2001, to stabilize its economy and promote trade.
Zimbabwe adopted the U.S. dollar as its de facto currency in 2009, after abandoning its own hyperinflated currency.
East Timor adopted the U.S. dollar as its official currency in 2000, after gaining independence from Indonesia.
Marshall Islands adopted the U.S. dollar as its official currency in 1986, under a compact of free association with the United States.