Public holidays in Rhodesia weekend". Shangani Day was replaced as a public holiday by Occupation Day in 1920, but continued to be unofficially marked thereafter. Occupation Day, held on 12 September each year, marked the anniversary of the arrival of the Pioneer Column at Fort Salisbury in 1890, and their raising of the Union Jack on the kopje overlooking the site. It was renamed Pioneers' Day in 1961. Southern Rhodesia effectively became the entirety of Rhodesia in 1964 when Northern Rhodesia became independent as Zambia. After Southern Rhodesia's colonial government unilaterally declared independence from Britain on 11 November 1965, the anniversary became celebrated as
Northern Rhodesia of further white minority governments in Africa, talk of amalgamation resumed. In 1927, the British government appointed the Hilton Young Commission on the possible closer union of the British territories in East and Central Africa. Its majority thought that Northern Rhodesia and Nyasaland should seek closer links with East Africa, but the minority report favoured linking these two territories with Southern Rhodesia on economic grounds. Even before the Commission's report was published, there were discussions between the Northern Rhodesian settlers and the Southern Rhodesian government on the terms of a total union of the two Rhodesias as a single colony.