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Imperial involvement

The vast majority of troops fighting for the British army came from Great Britain. Yet a significant number came from other parts of the British Empire. These countries had their own internal disputes over whether they should remain tied to London, or have full independence, which carried over into the debate around the sending of forces to assist the war. Though not fully independent on foreign affairs, these countries did have local say over how much support to provide, and the manner it was provided. Ultimately, Australia, Canada, New Zealand, and British South African Company-administered Rhodesia all sent volunteers to aid the United Kingdom. Troops were also raised to fight with the British from the Cape Colony and Natal. Some Boer fighters, such as Smuts and Botha, were technically British subjects as they came from the Cape Colony and Colony of Natal, respectively.

There were also many volunteers from the Empire who were not selected for the official contingents from their countries and travelled privately to South Africa to form private units, such as the Canadian Scouts and Doyle's Australian Scouts. There were also some European volunteer units from British India and British Ceylon, though the British Government refused offers of non-white troops from the Empire. Some Cape Coloureds also volunteered early in the war, but later some of them were effectively conscripted and kept in segregated units. As a community, they received comparatively little reward for their services. In many ways, the war set the pattern for the Empire's later involvement in the two World Wars. Specially raised units, consisting mainly of volunteers, were dispatched overseas to serve with forces from elsewhere in the British Empire.

The United States stayed neutral in the conflict, but some American citizens were eager to participate. Early in the war Lord Roberts cabled Burnham, a veteran of both Matabele wars but at that very moment prospecting in the Klondike, to serve on his personal staff as Chief of Scouts. Burnham went on to receive the highest awards of any American who served in the war, but American mercenaries participated on both sides.