Managing an empire means using minimum force, because a global empire is likely to be constantly at war if its first response is to use its own military. The primary strategy for empires is to use diplomacy or the military of others, rather their own. Arming those forces, and giving them political or economic inducements to fight, at least contains the problem without involving imperial forces. The British controlled India with relatively few British troops, using this technique. Over the course of a century, the British used large-scale military force rarely. When they used it against
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