The failed Jameson Raid ultimately triggered British takeover of the gold-rich Transvaal

Evidence

In the more extended term, then, the failed Raid nevertheless unsettled the boer republican government. It loosened boer grip on power along the Rand, leading ultimately to its undoing, the boer Republic’s dismantlement, and incorporation into the union that soon was to become South Africa. It was a matter of time before the Cape colonial government, commanded by their metropolitan imperial masters in London, thought it necessary to bring the Transvaal and its lucrative underground economy of gold production firmly under direct control, culmination of a 25-year dream of British administrators at the Cape. The Anglo-Boer War, 1899–1902, was the sharp instrument by which such control would be secured. — David Theo Goldberg, The Threat of Race, 1460