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In page Free State–Basotho Wars:

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In 1854, the cost of maintaining the sovereignty became too much for the British and they therefore handed over the territory to the Boers through the signing of the Sand River Convention. The Boers therefore claimed the land beyond the Caledon River, naming it the [[Republic of the Orange Free State]]. This began further conflict over land and undefined boundaries with the Basotho, who regarded themselves as the rightful owners, and who continued to use the land for grazing.[1]