Final answer:
The Boer War involved the Boers, British, and African tribes, fought over control of South Africa's mineral wealth. It led to Britain's temporary domination and the formation of the Union of South Africa, setting the foundation for Apartheid.
Step-by-step explanation:
The three groups involved in the Boer War were the Boers (Dutch settlers in South Africa), the British, and various African tribes such as the Xhosa and Basuto, who were affected by the expansion of Boer and British territories. The war was primarily fought over control of South Africa's valuable mineral resources, specifically diamonds and gold, which were discovered in the region. This conflict escalated into a full-scale war, with Britain seeking to assert control over the Boer republics - the Orange Free State and the Transvaal Republic - and ultimately the entire region.