August 11, 1867.
With the last group of Sultanate of Zanzibar nationals sent to Zanzibar Island, the East African Colony has completely gained control over the mainland territory of the Sultanate.
In order to facilitate the management of the colony and thoroughly assimilate these newly acquired lands,
After a series of studies and discussions by Ernst and the top officials of the colonial government, the administrative divisions of the East African Colony were further subdivided.
Firstly, the Kenyan colony was split into three administrative regions and merged into the East African Colony, from west to east.
The western region, with Kisumu on the north shore of Kavirondo Bay (Lake Victoria) as its capital, established the Western District of Kenya.