Final answer:
Colonialism is the strategy of a country using its power to control lands and people abroad.
Step-by-step explanation:
When a country uses its power to control lands and people abroad, it is following a strategy of colonialism. Colonialism refers to the practice of a nation extending its authority over other territories, often for economic and political gain. In colonialism, the controlling country (the colonizer) establishes settlements, exploits resources, and governs the territory.
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