The gaining of political and trade advantage over poorer nations by a powerful country that rules them directly or controls them indirectly or the policy or practice of building up an empire.

Question

The gaining of political and trade advantage over poorer nations by a powerful country that rules them directly or controls them indirectly or the policy or practice of building up an empire. 
What is being described in the above sentence.

GPT 3.5 · Answer

This is describing imperialism.