Understand historically where imperialism occurred to grasp the concept. European imperialists colonized large parts of Africa in the 19th century.
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Negative Connotation
'Imperialist' often carries a negative tone, criticizing overreaching power or control. Activists protested against what they called the imperialist agenda of the corporation.
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Modern Usage
Nowadays, 'imperialist' can be metaphorical, referring to any dominating entity. The company's imperialist approach to the market left little room for competitors.