▁ ▁Israel ▁and ▁the ▁United ▁States ▁were ▁members , ▁but ▁with d rew ▁claim ing ▁that ▁the ▁organization ▁had ▁an ▁anti - Is rael ▁bias . ▁ ▁Israel ▁joined ▁on ▁ 1 6 ▁September ▁ 1 9 4 9 , ▁but ▁with d rew ▁alongside ▁the ▁US ▁on ▁ 3 1 ▁December ▁ 2 0 1 8 . ▁ ▁The ▁US ▁originally ▁joined ▁as ▁a ▁found ing ▁member ▁on ▁ 4 ▁November ▁ 1 9 4 6 , ▁but ▁with d rew ▁on ▁ 3 1 ▁December ▁ 1 9 8 4 . ▁ ▁It ▁subsequently ▁rejo ined ▁on ▁ 1 ▁October ▁ 2 0 0 3 , ▁but ▁not ified ▁of ▁its ▁intention ▁to ▁withdraw ▁from ▁the ▁organization ▁on ▁ 1 2 ▁October ▁ 2 0 1 7 , ▁with ▁effect ▁ 3 1 ▁December ▁ 2 0 1 8 . ▁ ▁Its ▁membership ▁included ▁separate ▁NO C s ▁for ▁Gu am , ▁American ▁Sam oa , ▁Puerto ▁Rico ▁and ▁the ▁U . S . ▁Virgin ▁Islands . ▁ ▁Associ ate ▁members ▁The ▁ 1 1 ▁associate ▁members ▁of ▁UN ES CO ▁and ▁the ▁date ▁on ▁which ▁they ▁became ▁associate ▁members : ▁▁ ▁( 5 ▁November ▁ 2 0 1 3 ) ▁▁ ▁( 2 0 ▁October ▁ 1 9 8 7 ) ▁▁ ▁( 2 4 ▁November ▁ 1 9 8 3 ) ▁▁ ▁( 3 0 ▁October ▁ 1 9 9 9 ) ▁▁ ▁( 2 5 ▁October ▁ 2 0 1 1 ) ▁▁ ▁( 1 2 ▁October ▁