On 1 October 1933 it was split into the Lusambo and Léopoldville provinces.
On 27 May 1947 Lusambo was renamed Kasaï, which became an autonomous province of the Congo republic on 30 June 1960.
On 14 August 1962 Kasaï was divided into five new provinces: Lomami, Luluabourg, Sankuru, Sud-Kasaï and Unité Kasaïenne.
On 25 April 1966 Luluabourg and Unité Kasaïenne were united to form Kasaï-Occidental, while Lomami, Sankuru, and Sud-Kasaï were united in the new province of Kasaï-Oriental.
Kasaï-Occidental was split in 2015 into the Kasaï-Central and Kasaï provinces.