ine ▁claims ▁to ▁have ▁been ▁founded ▁in ▁ 8 4 2 ▁AD . ▁M ention ▁of ▁“ I wan uma ▁Castle ” ▁appears ▁in ▁early ▁Mur om achi ▁period ▁documents . ▁The ▁area ▁came ▁under ▁the ▁control ▁of ▁the ▁Date ▁cl an ▁of ▁Send ai ▁Domain ▁during ▁the ▁E do ▁period , ▁under ▁the ▁Tok ug awa ▁sh og un ate . ▁The ▁town ▁of ▁I wan uma ▁was ▁established ▁on ▁June ▁ 1 , ▁ 1 8 8 9 ▁with ▁the ▁establishment ▁of ▁the ▁modern ▁municipal ities ▁system . ▁ ▁The ▁village ▁of ▁Ok uma ▁merged ▁with ▁I wan uma ▁on ▁January ▁ 1 1 , ▁ 1 9 4 7 , ▁followed ▁by ▁S eng an ▁and ▁T ama ura ▁on ▁April ▁ 1 , ▁ 1 9 5 5 . ▁I wan uma ▁was ▁raised ▁to ▁city ▁status ▁on ▁November ▁ 1 , ▁ 1 9 7 1 . ▁ ▁The ▁city ▁was ▁seriously ▁affected ▁by ▁the ▁t sun ami ▁associated ▁with ▁the ▁ 2 0 1 1 ▁T ō h oku ▁earth qu ake , ▁which ▁resulted ▁in ▁ 1 8 0 ▁death s . ▁ ▁Government ▁I wan uma ▁has ▁a ▁mayor - c oun cil ▁form ▁of ▁government ▁with ▁a ▁directly ▁elected ▁mayor ▁and ▁a ▁un ic amer al ▁city ▁legisl ature ▁of ▁ 2 0 ▁members . ▁ ▁Education ▁I wan uma ▁has ▁four ▁public ▁elementary ▁school ▁and ▁four ▁public ▁middle ▁schools ▁operated ▁by ▁the ▁city ▁government , ▁and ▁one ▁public ▁high ▁school ▁operated ▁by ▁the