Aden Protectorate
South Yemen's origins can be traced to 1874 with the creation of the British Colony of Aden and the Aden Protectorate, which consisted of two-thirds of the present-day Yemen. However, Aden became a province within British India in 1937. After the collapse of Aden Protectorate, a state of emergency was declared in 1963, when the National Liberation Front (NLF) and the Front for the Liberation of Occupied South Yemen (FLOSY) rebelled against British rule.