The fortunes and misfortunes of Kikuyus and Maasai makes for an interesting read. At their apex..the Maasai were the populous tribe of Kenya..occupying or having grazing rights to nearly half of Kenya. Kenyans then were like 1M people. The Maasai were most likely the most populous with about 0.2M people occupying the largest territory - just few kilometers from Mombasa - and all the way west to Mt Elgon - up North from Lake Turkana down south to Lake Tanganyika. Maasai reputation as the noble savages of Africa were heard far and wide - including in modern world of Europe - their reputation for bravery was unmatched - Somalis & Oromos quickly bailed out of Kenya - Kalenjin and everyone else quickly took into the forested hills - and nearly all Kenya plains were left for the Maasai. In come the in-fighting and the arrival of Brits.The proud Maasai (they had every reason to be proud) refuses to embrace change and stuck to their old ways.The Kikuyu on the other hand - maybe about 150K - a small community wedged in the forested highlands by ferocious Maasais - most communities would use forests & hills to even out things with Maasai - but absolutely nobody stood any chance in the plains at the Maasai apex -maybe Kalenjin and Turkana could hold some ground - but generally Maasai would out-gun you because they could raises even 10K warriors and attack (they were the most populous). Kikuyus tired of Maasai - quickly embraces the colonizing British -allowing them to set up camps (forts) in their land - and become their pliable or willing slaves. They embraces modernity, their population quickly rises to about 1M by time the British left and they go to school. The kikuyus goes on to conquer Maasai land starting from Nairobi, Nyandarua, Lakipia, Nakuru, even Narok and Kajiado. Their expansion West only stopped by Kalenjin loud complains and murmurs.Their population shots even higher in 60s & & &0s - until now they are possibly 8M.
Note, Kenya communities are very tiny, compared to say Somalis, Oromos,Amharas, Tutsi, Hutus, Kongo, Ibos, Fulanis, Yorubas. My Ethiopia friend told me kikuyus in Kenya would be classified under the small communities - Southern Nations etc..because a tribe like Oromo or Amhara are like 35M.