Captivity of an individual is real. The captivity of nations or kingdoms is also real.
The history of the geographic area known as 'Nigeria' did not start in 1914 or in 1900. It dates to before the common era (BCE). But in the nineteenth and twentieth centuries of the common era (CE), the process of colonialism, which was supported by violence and crimes against humanity, nullified multiple sovereign nations and kingdoms.
"Nigeria is Not a Country" gives an account of how pre-colonial African nations and kingdoms within the geographic area of Nigeria were led into captivity. The book also presents a portrait of the price the residents in that geographic area are paying to remain in a man-made captivity.