Limiting contact with foreigners was the main goal of Chinese

corruption.

isolationism.

kowtowing.

missionaries.

Limiting contact with foreigners was the main goal of Chinese isolationism. So, in the 15th century, the foreign policy of the Ming dynasty in China became increasingly isolationist. It was the Hongwu Emperor that tried to propose the policy to ban all maritime shipping in 1371. The Qing dynasty followed in his footsteps, and often continued with the same practice of isolationism.

The answer is Isolationism. Many Asian countries have isolated their country for various reasons. One of them is preserving their culture. Another reason would be to protect their leaders. Allowing foreigner groups to enter can sway people to revolution and possibly change the leaders of a certain country