Final answer:
China was never formally colonized but came under European imperialism and trade controls as a result of the Opium Wars in the 1800s.
Step-by-step explanation:
The subject of this question is History. This question is asking about a country that was never formally colonized but came under European imperialism and trade controls. Based on the provided information, this country is China. Although China was never formally colonized, it was brought under European imperialism and trade controls as a result of the treaties that settled the Opium Wars in the 1800s.