Why did Korea choose to isolate itself in the 1500's? A. They were unable to successfully participate in global trade. B. They were secretly building up a military in order to conquer enemy nations. C. The country was devastated by invasions of the Japanese and Manchus

The correct answer is C.

By the end of the sixteenth century (1500s), Korea chose to isolate itself because of the devastating invasions by the Japanese and the Manchus located in Northeast Asia.

Because of the invasions, Korea put a strict policy in place which restricted outside contact with other countries.