I believe they haven't.
We can see this through the language that is chosen by the author to desrcibe Okonkwo's encounter with White men. The author use language such as 'the first shadow' of white men. This phrase indicates that prior to that occurence, they never made contact to any white men before.
A. This region receives the best rainfall and climate for farming
What the dude above me said ✨
A driver should never stop in front of a public or private driveway unless instructed to do so by a police officer.
