noun
a policy of extending a country's power and influence through colonization, use of military force, or other means
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Imperialism is the policy of extending a country's power and influence through colonization or military force.
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Some people believe that imperialism is a thing of the past, but others argue it still exists in different forms.
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The country's imperialism game is strong, they're always trying to expand their territory.
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Her imperialism over the group was evident as they all followed her lead without question.