South Kasai secedes from the Congo.

South Kasai was an unrecognised secessionist state within the Republic of the Congo which was semi-independent between 1960 and 1962. Initially proposed as only a province, South Kasai sought full autonomy in similar circumstances to the much larger neighbouring state of Katanga, to its south, during the political turmoil arising from the independence of the Belgian Congo known as the Congo Crisis. Unlike Katanga, however, South Kasai did not explicitly declare full independence from the Republic of the Congo or reject Congolese sovereignty.

The Republic of the Congo was a state during the period of history of the Democratic Republic of the Congo between 1960 and 1971. Located in Central Africa, the state was created with the independence of the Belgian Congo in 1960. From 1960 to 1966, the country was also known as Congo-Léopoldville to distinguish it from its northwestern neighbor, which is also called the Republic of the Congo, alternatively known as "Congo-Brazzaville". In 1964, the state's official name was changed to the Democratic Republic of the Congo, but the two countries continued to be distinguished by their capitals; with the renaming of Léopoldville as Kinshasa in 1966, it also became known as Congo-Kinshasa. After Joseph Désiré Mobutu, commander-in-chief of the national army, seized control of the government in 1965, the Democratic Republic of the Congo became the Republic of Zaire in 1971; but it was reverted back to the Democratic Republic of the Congo in 1997. The period between 1960 and 1964 is referred to as the First Congolese Republic.