10 November 1964
Almost a year after Kenya gained independencethe Kenya African National Union (KANU) under Jomo Kenyatta and its main opposition party united to form a party with near-complete control over the government. In 1964, Kenyatta had the legislature create the position of president and granted him considerable executive powers. In 1969 Kenyatta banned a new opposition party so he could run unopposed.
References

The New York Times, (2011), ‘Dec. 12, 1963 Kenya Gains Independence’, 12 December, [online], available at https://learning.blogs.nytimes.com (Accessed: 01 October 2012)|

Body-Evans A. ‘This day in African history: 10 November’, from About African History, [online], available at www.africanhistory.about.com (Accessed: 01 October 2012)