Kenya's political system runs on ethnicity. Not because Kenyans are inherently tribal, but because the state was built that way. Colonial administrators divided the country into ethnic units. Post-independence elites inherited the model and weaponized it. Kenyatta favored Kikuyu. Moi rewarded Kalenjin. Kibaki returned to Kikuyu networks. Uhuru tried to expand the base but still governed through ethnic coalitions. Ruto marketed himself as post-tribal but assembled a Cabinet along familiar lines. This trail traces how ethnicity became the operating system of Kenyan politics, and why every reform movement has failed to dismantle it.