ance ▁in ▁Gu am ▁affairs . ▁This ▁eventually ▁led ▁to ▁res ent ment , ▁and ▁thus ▁increased ▁political ▁pressure ▁from ▁Cham or ro ▁leaders ▁for ▁greater ▁aut onomy . ▁ ▁The ▁result ▁was ▁the ▁Gu am ▁Organ ic ▁Act ▁of ▁ 1 9 5 0 ▁which ▁established ▁Gu am ▁as ▁an ▁un in cor por ated ▁organized ▁territory ▁of ▁the ▁United ▁States ▁and , ▁for ▁the ▁first ▁time ▁in ▁Gu am ▁history , ▁provided ▁for ▁a ▁civil ian ▁government . ▁ ▁The ▁Im m igration ▁and ▁National ity ▁Act ▁of ▁ 1 9 5 2 , ▁section ▁ 3 0 7 , ▁granted ▁U . S . ▁citizens hip ▁to ▁" all ▁persons ▁born ▁in ▁the ▁island ▁of ▁Gu am ▁on ▁or ▁after ▁April ▁ 1 1 , ▁ 1 8 9 9 . ▁In ▁the ▁ 1 9 6 0 s , ▁the ▁island ' s ▁required ▁security ▁clear ance ▁for ▁visitors ▁was ▁lifted . ▁ ▁On ▁September ▁ 1 1 , ▁ 1 9 6 8 , ▁eigh teen ▁years ▁after ▁passage ▁of ▁the ▁Organ ic ▁Act , ▁Congress ▁passed ▁the ▁" E lect ive ▁Governor ▁Act " ▁( Public ▁Law ▁ 9 0 - 4 9 7 ), ▁which ▁allowed ▁the ▁people ▁of ▁Gu am ▁to ▁elect ▁their ▁own ▁governor ▁and ▁lieutenant ▁governor . ▁Near ly ▁four ▁years ▁later , ▁Congress ▁passed ▁the ▁" Gu am - V ir gin ▁Islands ▁De legate " ▁Act ▁that ▁allowed ▁for ▁one ▁Gu am ▁delegate ▁in ▁the ▁U . S . ▁House ▁of