Assertion: imperialism's control | /r/CapableOf | prevent such an outcome
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text: British gains in southern and East Africa prompted Rhodes and Alfred Milner, Britain's High Commissioner in South Africa, to urge a "Cape to Cairo" empire: linked by rail, the strategically important Canal would be firmly connected to the mineral-rich South, though Belgian control of the Congo Free State and German control of German East Africa prevented such an outcome until the end of World War I, when Great Britain acquired the latter territory.