8 9 8 . ▁As ▁the ▁largest ▁island ▁in ▁Mic ron esia ▁and ▁the ▁only ▁American - h eld ▁island ▁in ▁the ▁region ▁before ▁World ▁War ▁II , ▁Gu am ▁was ▁occupied ▁by ▁the ▁Japanese ▁between ▁December ▁ 1 9 4 1 ▁and ▁July ▁ 1 9 4 4 . ▁Today , ▁Gu am ' s ▁economy ▁is ▁mainly ▁supported ▁by ▁tour ism ▁( prim arily ▁from ▁Japan ) ▁and ▁U . S . ▁military ▁bases . ▁ ▁General ▁reference ▁▁ ▁Pr on unci ation : ▁▁ ▁Common ▁English ▁country ▁name : ▁Gu am ▁ ▁Official ▁English ▁country ▁name : ▁The ▁United ▁States ▁Territ ory ▁of ▁Gu am ▁ ▁Common ▁end onym ( s ): ▁List ▁of ▁countries ▁and ▁capit als ▁in ▁native ▁languages ▁ ▁Official ▁end onym ( s ): ▁List ▁of ▁official ▁end onym s ▁of ▁present - day ▁nations ▁and ▁states ▁ ▁Ad ject ival ( s ): ▁Gu aman ian ▁ ▁Dem onym ( s ): ▁ ▁Et ym ology : ▁Name ▁of ▁Gu am ▁ ▁ISO ▁country ▁codes : ▁G U , ▁G UM , ▁ 3 1 6 ▁ ▁ISO ▁region ▁codes : ▁See ▁ISO ▁ 3 1 6 6 - 2 : G U ▁ ▁Internet ▁country ▁code ▁top - level ▁domain : ▁. gu ▁ ▁Geography ▁of ▁Gu am ▁ ▁Geography ▁of ▁Gu am ▁ ▁Gu am ▁is : ▁a ▁United ▁States ▁territory ▁ ▁Location : ▁ ▁Northern ▁Hem is phere ▁and ▁Eastern ▁Hem is phere ▁ ▁Pacific ▁Ocean ▁ ▁North ▁Pacific ▁ ▁O ce