imperialism is basically what happens when a powerful state starts deciding that another place should serve its interests.
sometimes that meant directly conquering territory, like britain ruling india. sometimes it meant controlling trade, resources, governments, or political decisions without formally owning the country.
anthropologically, imperialism also changed languages, religions, education, identities, and even what people were taught to think of as “civilized.”
that’s why its effects don’t disappear when an empire leaves. borders, institutions, inequalities, and cultural hierarchies can survive for generations after the flag comes down.