Answer: Imperialism and anti-imperialism are two directly opposite terms.
Explanation:
Imperialism appeared in humanity's earliest history, and time was pretty much all brutal. Science defines imperialism as the most brutal cloud of oppression and exploitation. In practice, imperialism involves the oppression of less developed resource-rich groups to obtain various forms of material gain.
Anti-imperialism does the opposite of the above. Anti-imperialism implies the condemnation of conquering wars, marching outside the borders of the countries of origin to subjugate less developed civilizations. Anti-imperialism is at odds with colonial politics and all the fragments that colonialism contains.