Yankin Tsakiyar-Yamma ya kasance rabon Najeriya daga 1963 zuwa 1991, daga 1976 ana kiranta da Bendel state. An kafa shi a watan Yunin 1963 daga Benin da lardunan Delta na Yammacin Yankin, kuma babban birninta shi ne Benin City . An sake canza mata suna zuwa lardi a 1966, kuma a 1967 lokacin da aka raba sauran lardunan zuwa jihohi da yawa, ya ci gaba da kasancewa yanki yanakke, ya zama jiha. A lokacin yakin basasar Najeriya, sojojin Biafra sun mamaye sabuwar kasar ta Mid-Western, akan hanyarsu ta zuwa Lagos, a kokarin tilasta kawo karshen yakin cikin gaggawa. Yayin da yake karkashin mamayar Biafra, an ayyana jihar a matsayin " Jamhuriyar Benin ". Yayin da sojojin Najeriyar suka sake kwace yankin, jamhuriya ta ruguje ne kwana daya kacal bayan sanarwar lokacin da sojojin Najeriyar suka kame garin Benin. A shekarar 1976 aka sake yiwa jihar suna Bendel . An raba shi zuwa jihar Delta da Edo a cikin 1991. Yankin ya kunshi tsoffin lardunan Benin da Delta. Lardunan Benin suna da masu magana da yaren Edo yayin da lardin Delta ke da Ijaws, Isekiri, Urhobo, Isoko da Ukwuani masu magana ban da Ika da Aniocha.