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Origins

The origins of the war were complex and stemmed from more than a century of conflict between the Boers and Britain. Of immediate importance, however, was the question of who would control and benefit most from the very lucrative Witwatersrand gold mines discovered by Jan Gerrit Bantjes in June 1884.

The first European settlement in South Africa was founded at the Cape of Good Hope in 1652, and thereafter administered as part of the Dutch Cape Colony. The Cape was governed by the Dutch East India Company, until its bankruptcy in the late 18th century, and was thereafter governed directly by the Netherlands. As a result of political turmoil in the Netherlands, the British occupied the Cape three times during the Napoleonic Wars, and the occupation became permanent after British forces defeated the Dutch at the Battle of Blaauwberg in 1806. At the time, the colony was home to about 26,000 colonists settled under Dutch rule. A relative majority represented old Dutch families brought to the Cape during the late 17th and early 18th centuries; however, close to one-fourth of this demographic was of German origin and one-sixth of French Huguenot descent. Cleavages were likelier to occur along socio-economic rather than ethnic lines. Broadly speaking, the colonists included a number of distinct subgroups, including the Boers. The Boers were itinerant farmers who lived on the colony's frontiers, seeking better pastures for their livestock. Many were dissatisfied with aspects of British administration, in particular with Britain's abolition of slavery on 1 December 1834. Boers who used forced labor would have been unable to collect compensation for their slaves. Between 1836 and 1852, many elected to migrate away from British rule in what became known as the Great Trek.

Around 15,000 trekking Boers departed the Cape Colony and followed the eastern coast towards Natal. After Britain annexed Natal in 1843, they journeyed farther northwards into South Africa's vast eastern interior. There, they established two independent Boer republics: the South African Republic (1852; also known as the Transvaal Republic) and the Orange Free State (1854). Britain recognised the two Boer republics in 1852 and 1854 but attempted British annexation of the Transvaal in 1877 led to the First Boer War in 1880–1881. After Britain suffered defeats, particularly at the Battle of Majuba Hill (1881), the independence of the two republics was restored, subject to certain conditions. However, relations remained uneasy.

In 1866, diamonds were discovered at Kimberley, prompting a diamond rush and a massive influx of foreigners to the borders of the Orange Free State. Then, in June 1884, gold was discovered in the Witwatersrand area of the South African Republic by Jan Gerrit Bantjes. Gold made the Transvaal the richest nation in southern Africa; however, the country had neither the manpower nor the industrial base to develop the resource on its own. As a result, the Transvaal reluctantly acquiesced to the immigration of uitlanders (foreigners), mainly English-speaking men from Britain, who came to the Boer region in search of fortune and employment. As a result, the number of uitlanders in the Transvaal threatened to exceed the number of Boers, precipitating confrontations between the Boer settlers and the newer, non-Boer arrivals.

Britain's expansionist ideas (notably propagated by Cecil Rhodes) as well as disputes over uitlander political and economic rights led to the failed Jameson Raid of 1895. Dr. Leander Starr Jameson, who led the raid, intended to encourage an uprising of the uitlanders in Johannesburg. However, the uitlanders did not take up arms in support, and Transvaal government forces surrounded the column and captured Jameson's men before they could reach Johannesburg.

As tensions escalated, political manoeuvrings and negotiations attempted to reach compromise on the issues of uitlanders' rights within the South African Republic, control of the gold mining industry, and Britain's desire to incorporate the Transvaal and the Orange Free State into a federation under British control. Given the British origins of the majority of uitlanders and the ongoing influx of new uitlanders into Johannesburg, the Boers recognised that granting full voting rights to the uitlanders would eventually result in the loss of ethnic Boer control in the South African Republic.

The June 1899 negotiations in Bloemfontein failed, and in September 1899 British Colonial Secretary Joseph Chamberlain demanded full voting rights and representation for the uitlanders residing in the Transvaal. Paul Kruger, the President of the South African Republic, issued an ultimatum on 9 October 1899, giving the British government 48 hours to withdraw all their troops from the borders of both the Transvaal and the Orange Free State, failing which the Transvaal, allied to the Orange Free State, would declare war on the British government. (In fact, Kruger had ordered commandos to the Natal border in early September, and Britain had only troops in garrison towns far from the border.) The British government rejected the South African Republic's ultimatum, and the South African Republic and Orange Free State declared war on Britain.