▁province ▁last ed ▁until ▁ 1 9 5 5 ▁when ▁it ▁was ▁merged ▁into ▁the ▁new ▁province ▁of ▁West ▁Pakistan , ▁under ▁the ▁One ▁Unit ▁policy ▁ ▁announced ▁by ▁Prime ▁Minister ▁Ch aud h ry ▁Moh amm ad ▁Ali . ▁M ian w ali ▁and ▁At to ck ▁were ▁removed ▁from ▁it ▁and ▁merged ▁with ▁P un j ab . ▁It ▁was ▁re created ▁after ▁the ▁dissol ution ▁of ▁the ▁One ▁Unit ▁system ▁and ▁last ed ▁under ▁its ▁old ▁nom en cl ature ▁until ▁April ▁ 2 0 1 0 , ▁when ▁it ▁was ▁renamed ▁as ▁the ▁' K hy ber ▁Pak ht unk h wa ' ▁province . ▁ ▁Government ▁The ▁offices ▁of ▁Governor ▁and ▁Chief ▁Minister ▁of ▁the ▁North - West ▁Front ier ▁Province ▁last ed ▁until ▁ 1 4 ▁October ▁ 1 9 5 5 . ▁ ▁Dem ograph ics ▁At ▁independence ▁there ▁was ▁a ▁clear ▁Muslim ▁Pas ht un ▁majority ▁in ▁then ▁North - West ▁Front ier ▁Province , ▁although ▁there ▁were ▁some ▁small ▁minor ities ▁of ▁H ind us ▁and ▁S ik hs . ▁The ▁languages ▁of ▁the ▁North - West ▁Front ier ▁Province ▁included ▁Pas ht o , ▁H ind ko , ▁Koh ist ani ▁and ▁others , ▁although ▁most ▁of ▁the ▁population ▁spoke ▁Pas ht o . ▁Prior ▁to ▁the ▁arrival ▁of ▁the ▁British , ▁the ▁official ▁language , ▁for ▁government al ▁uses ▁and ▁such , ▁was ▁Pers ian . ▁ ▁See ▁also ▁ ▁K hy ber ▁Pak ht unk h wa ▁ ▁Feder ally ▁Admin