What year did Kenya become a republic?

Kenya was declared a republic on 12 December 1964, when substantial changes were made to the Kenyan constitution to provide for governance of the country as a presidential republic. Elizabeth II ceased to be head of state and the position of Governor-General was abolished. The British Parliament enacted the Kenya Republic Act 1965 to provide that Kenya's status as a republic would not affect Kenyans' status as Commonwealth citizens and British subjects.

From independence on 12 December 1963 to the constitutional reforms of 12 December 1964, Kenya was governed as a constitutional monarchy with Elizabeth II as head of state. All duties of the Queen were exercised by the Governor-General of Kenya. Though Kenyan citizens ceased to be citizens of the United Kingdom and Colonies on independence, they remained British subjects by virtue of their citizenship in a country that was a member of the Commonwealth.