Guam was captured, and is still controlled today, by America.
Guam ( [ ˈɡwɑːm ] or [ ˈɡwɒm ] Chamorro : Guåhån [ ˈɡʷɑhɑn ] formally the Territory of Guam ) is an unincorporated and organized territory of the United States . During the Spanish -- American War , the United States captured Guam on June 21 , 1898 .