Ask for advice: which countries have closed their doors in history?

The closed-door policy, also known as foreign ban and maritime ban, refers to a closed-door national policy and is a typical isolationism. Strict restrictions on foreign economic, cultural and scientific exchanges, so China's comprehensive national strength and development lags behind western countries.

China has imposed a maritime ban for more than 400 years. Zheng He's voyages to the West (1405- 1433) From the founding of the Ming Dynasty to Xuanzong of the Ming Dynasty, the Ming Dynasty imposed a maritime ban, which was a symbol of the Ming Dynasty's lock on the country.

1723 (the first year of Yongzheng), due to a fierce dispute with the Holy See about Chinese etiquette, Yong Zhengdi banned Catholicism, banned foreign missionaries from preaching in China, and restricted trade, which was regarded as the beginning of the national lock-up. By 1757 (twenty-two years of Qianlong), Emperor Qianlong had issued an imperial edict from Beijing to coastal provinces, ordering Xiamen, Ningbo and other ports to stop trade with the West, which was the so-called "one-stop" policy.

The idea of "closed door" or "closed door" policy in Qing Dynasty originated from British businessmen trying to sell their goods (especially opium) to China at that time. Marx once accepted this view in his article, and later this view was incorporated into the mainstream ideology of China at that time in 1950s, and was written into textbooks, forming the view of "the Ming and Qing Dynasties closed their doors to the outside world". Scholars pointed out from three restrictive policies, such as "sea ban" and "one-stop trade", that even the official policies in the Ming and Qing Dynasties were not closed to the outside world for a long time, and neither were the actual micro-behaviors and macro-effects in the implementation of relevant policies. In addition, in the Ming and Qing Dynasties, although it was almost completely banned from the early Ming Dynasty to the opening and closing period of Qin Long, it was still opened in Zhangzhou Yuegang in the middle of16th century when Qin Long opened and closed. In Ming Dynasty, 75% closed the sea, and 25% was open to the sea. In the Qing Dynasty before the Opium War, the customs clearance period accounted for about 15%, and the opening period accounted for about 85%.