Abia State
27 August 1991
Imo State
Adamawa State
27 August 1991
Gongola State
Akwa Ibom State
23 September 1987
Cross River State
Anambra State
27 August 1991
(old) Anambra State
Bauchi State
3 February 1976
North-Eastern State
Bayelsa State
1 October 1996
Rivers State
Benue State
3 February 1976
Benue-Plateau State
Borno State
3 February 1976
North-Eastern State
Cross River State
27 May 1967
Eastern Region; known
as South-Eastern State
from 1967 to 1976.
Delta State
27 August 1991
Bendel State
Ebonyi State
1 October 1996
Enugu State and Abia
State
Edo State
27 August 1991
Bendel State
Ekiti State
1 October 1996
Ondo State
Enugu State
27 August 1991
(old) Anambra State
Gombe State
1 October 1996
Bauchi State
Imo State
3 February 1976
East Central State
Jigawa State
27 August 1991
Kano State
Kaduna State
27 May 1967
Northern Region; known
as North-Central State
from 1967 to 1976.
Kano State
27 May 1967
Northern Region
Katsina State
23 September 1987
Kaduna State
Kebbi State
27 August 1991
Sokoto State
Kogi State
27 August 1991
Kwara State; Benue
State
Kwara State
27 May 1967
Northern Region; known
as West Central State
from 1967 to 1976.
Lagos State
27 May 1967
Federal Territory of
Lagos and Colony
Province
Nasarawa State
1 October 1996
Plateau State
Niger State
3 February 1976
North-Western State
Ogun State
3 February 1976
Western State
Ondo State
3 February 1976
Western State
Osun State
27 August 1991
Oyo State
Oyo State
3 February 1976
Western State
Plateau State
3 February 1976
Benue-Plateau State
Rivers State
27 May 1967
Eastern Region
Sokoto State
3 February 1976
North-Western State
Taraba State
27 August 1991
Gongola State
Yobe State
27 August 1991
Borno State
Zamfara State
1 October 1996
Sokoto State
Abuja Federal Capital
Territory
3 February 1976
Benue-Plateau, North-
Central, and North-
Western States
http://www.google.com.ng/url?q=https://en.wikipedia.org/wiki/List_of_Nigerian_states_by_date_of_statehood&sa=U&ved=0ahUKEwj1vunM4YbNAhVS12MKHVBaCTEQFggbMAM&sig2=VD6PjDn8QBcXbMgkAelkHQ&usg=AFQjCNGoDg-s0jGxcJQLDK6aoB1697jZYA

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Gradually they divided one into many and then turn them against each other by calling it sub regions.