I read the non-fiction book "The Taking of Getty Oil" about a 1970s series of oil company mergers and acquisitions, and the length that the oil negotiators go to, to include and pay (bribe?) the national leaders is obvious over and over.. The USA and its oil market partners like Shell had been bitten by overseas power dynamics multiple times, and they specifically evolved strategy post-British Colonialism ..
There is so much reward for the winners in these exchanges, that yes they do try different commercial arrangements to make it stick; and that changes over time.
As an American schoolchild we studied Nigeria as a success story and a hopeful future for Americans who wanted a modern stable country in Africa. From what I can tell in passing, the reality is repeatedly short of the lofty goals set long ago. It might be said that there is some responsibility for the sad state of affairs there, with the people who are local and governing, not just the terrible hands of America or Dutch-Royal Shell, right?
--
from the wikipedia EN page on Nigeria:
Ethnocentrism, tribalism, religious persecution, and prebendalism have plagued Nigerian politics both prior and subsequent to independence in 1960. All major parties have practised vote-rigging and other means of coercion to remain competitive.