Define "imperialism."

The concept of imperialism is accurately defined as the policy of extending a country's power and influence through colonization or military force. This definition encompasses the historical context in which imperialist nations sought to expand their territories and assert dominance over other regions. Such actions often involved the acquisition of land, the exploitation of resources, and the imposition of political control over the local populations. Imperialism played a significant role in shaping international relations and the modern world, particularly during the 19th and early 20th centuries when powerful countries established vast empires, greatly influencing economic and cultural dynamics worldwide.

In contrast, the other options do not capture the aggressive and expansive nature of imperialism. For instance, merely extending influence through passive negotiation, establishing trade agreements, or implementing tariffs focuses more on diplomatic and economic strategies rather than the direct control and domination characteristic of imperialism. Therefore, the emphasis on colonization and military force clearly differentiates imperialism from other forms of international interaction.