18 May 1902
At the end of the South African War (also known as the Anglo-Boer War) of 1899-1902, negotiators for the Afrikaner republics of the Transvaal and Orange Free State travelled to Pretoria to present their terms of surrender to British representatives, Lord Milner and Lord Kitchener. The negotiators were still asking for continued independence of the former republics. The War ended on 31 May 1902 with the signing of the Treaty of Vereeniging. The peace settlement brought to an end the Transvaal and the Orange Free State as Boer republics. However, the British offered the Afrikaner £3 million for restocking and repairing farm lands and promised eventual self-government, a promise which was fulfilled in 1907.
References

Boddy-Evans A. ‘This Day in African History: 18 May’, from About.com African History, [online], available at www.africanhistory.about.com (Accessed: 24 April 2012)|Spartacus Educational, ‘The Boer War’, [online], available at https://www.spartacus.schoolnet.co.uk (Accessed: 24 April 2012)|Anglo-Boer War Museum, ‘Peace Treaty of Vereeniging’, [online], available at www.anglo-boer.co.za (Accessed: 24 April 2012)