You have to understand things.
Why did the Maasai easily hand over their land.
Brits had been in Mombasa and Zanzibar for 100yrs - circling - but Maasai were fearsome and strong.
When Maasai started civil war - they became so weak - other tribes started beating them.
Before that Maasai were unbeatable. Not by anyone. Even the British feared. The Arab Slave traders told them as much.
Maasai were like the Vikings. Tribes - from luhyas, luo, kalenjin, kikuyu, somalis, kambas, would steal Maasa kids just to Artificially Inseminate their bravery on them.
The Maasai were not a small tribe - they were popolous - and would raise as much as 10,000 troops (warriors) at one go. That was a spectacle then - and would basically overrun anybody. You could be strong - but 10,000 troops was about many of current tribes population.
Only the Ogoni - Zulu breakway - did stop the Maasai - otherwise Maasai march from South Sudan was the most momentous historical event in East Africa.
But btw 1850 - 1900 - Maasai were fast loosing territory amidst their civil war, rinderpest (from Asia through Eritrea) and name it.
So Maasai basically handed over territories they were losing or about to lose.
In Meru and Nyeri - Mt Kenya - they were starting to lose Timau and Mt Kenya.
In kiambu - they were losing
In Uasing gishu and Tranzoia - they were losing to Nandis and Pokots - and Keiyos.
In Nakuru they were losing to Kipsigis (not kikuyus) and Tugens.
In Nyando valley - they had lost to Luos and Kipsigis.
please don't twist history.
Their territory before then extended nearly all the provinces
You see RV , this is a good point you put out. Much of the land in Kenya was no Mans land . The Maasai used to be pastoralist and nomads .Further Kikuyus Kamba and Maasai used to raid each other . Thats how Kikuyu assimilated the doruba and Kamba were able to acquire Makueni .
If Nandi can claim Uasin Ngishu which is a Known Maasai land , what is wrong with Kikuyu claiming Nakuru which actually prior to settlers it was not inhabited .
You are one of the first people to say Nairobi was Maasai land and colonialist came and found Waiyaki wa Hinga already having his village there in Dagoretti . Why the double standards ?