[@Vilageidiotx]

0_0. Humm. Checked this out - https://en.wikipedia.org/wiki/List_of_countries_by_population_in_1900

Jumping weasels on the back of a monkey. I think I might have to give Northern Nigeria (the more Islamic part) up - perhaps as a 'restored' region. And namely make due with Cameroon, Togoland and Southern Nigeria, also parts of France Gabon. Which...ohhh...boy. Will bring my population up already to 15 million. Yeah, I think - having a mandatory bread & circus + mandatory improvement of the local population a must. 

Especially, if I had done it without much homeland support.