Which of the following best defines imperialism?

The concept of imperialism is best defined as a policy of extending a country's power and influence through colonization, military force, or other means. This definition encompasses the historical practices of powerful nations seeking to dominate weaker regions, often resulting in the establishment of colonies. Imperialism has been a significant factor in shaping global history, as it has led to cultural exchanges, economic exploitation, and significant geopolitical changes.

Colonization and military conquest are central to this process, as they allow a nation to exert control over foreign territories and people, thus expanding its influence. Additionally, imperialism often involves economic motives, including the extraction of resources, the establishment of trade routes, and the desire for strategic advantages over rivals.

The other options do not encapsulate the essence of imperialism. Promoting democracy, establishing frameworks for global trade, or crafting strategies for international diplomacy can be aspects of a nation’s foreign policy, but they do not specifically address the notion of extending a country's power through direct control or influence, which is at the core of imperialism.