qi ▁forces ▁fought ▁a ▁stronger - than - expected ▁milit ant ▁Ira qi ▁ins ur gency , ▁leading ▁to ▁difficult ▁living ▁conditions ▁for ▁the ▁population ▁of ▁Ira q ▁throughout ▁the ▁period . ▁ ▁Military ▁occupation ▁ ▁A ▁military ▁occupation ▁was ▁established ▁and ▁run ▁by ▁the ▁Co al ition ▁Pro vis ional ▁Author ity ▁( CP A ), ▁which ▁later ▁appointed ▁and ▁granted ▁limited ▁powers ▁to ▁an ▁Ira q ▁Inter im ▁G over ning ▁Council . ▁Tro ops ▁for ▁the ▁invasion ▁came ▁primarily ▁from ▁the ▁United ▁States , ▁the ▁United ▁Kingdom ▁and ▁Australia , ▁but ▁ 2 9 ▁other ▁nations ▁also ▁provided ▁some ▁troops , ▁and ▁there ▁were ▁varying ▁levels ▁of ▁assistance ▁from ▁Japan ▁and ▁other ▁al lied ▁countries . ▁T ens ▁of ▁thousands ▁of ▁private ▁security ▁personnel ▁provided ▁protection ▁of ▁infrastr ucture , ▁facilities ▁and ▁personnel . ▁ ▁Co al ition ▁and ▁al lied ▁Ira qi ▁forces ▁fought ▁a ▁stronger - than - expected ▁milit ant ▁Ira qi ▁ins ur gency , ▁and ▁so ▁the ▁reconst ruction ▁of ▁Ira q ▁was ▁slow . ▁In ▁mid - 2 0 0 4 , ▁the ▁direct ▁rule ▁of ▁the ▁C PA ▁was ▁ended ▁and ▁a ▁new ▁" so ver eign ▁and ▁independent " ▁Inter im ▁Government ▁of ▁Ira q ▁assumed ▁the ▁full ▁responsibility ▁and ▁authority ▁of ▁the ▁state . ▁The ▁C PA ▁and ▁the ▁G over ning ▁Council ▁were ▁dis band ed ▁on ▁ 2 8 ▁June ▁ 2 0 0 4 , ▁and ▁a ▁new ▁trans itional ▁constitution ▁came ▁into ▁effect . ▁ ▁S over