Final answer:
Britain was the most dominant imperial power with extensive colonies worldwide, followed by France, Russia, and Germany.
Explanation:
Britain had the most colonies spread out across the world during the era of imperialism. At its peak, the British Empire governed a vast number of territories, influencing regions across Asia, Africa, and the Americas. Other major imperial powers such as France, Russia, and Germany also held significant colonial possessions in various parts of the world.
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