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Voyages (especially in the Ming Dynasty, when navigation technology was not very developed) were due to many factors to consider, such as wind direction, seasons, ocean currents, grain and grass, the physical and psychological condition of sailors, and the customs and customs of coastal areas. Zheng He had no precedent back then, and he didn't have a map to explore on his own. It's not easy to get to the east coast of Africa, and if you go further west, you may not be able to.
Moreover, Zheng He's voyage to the West is not like the voyage of European navigators, it is to pursue wealth, and there is a reason why he must go. He spent almost all his money, and although he could be famous and build friendly relations, he could barely make money. Continuing to go west, it has created an even greater burden on the country.
Although the Ming Dynasty was rich, it also had to be moderately defeated.
Besides, Zheng He's voyage to the West experienced two generations of emperors, Ming Chengzu Zhu Di and his son Zhu Gaochi, and there were several major political turmoil, and political reasons also affected his activities in the West.
Finally, I have a personal feeling that you can look at the world map, from the east coast of Africa to the west, to go around the Cape of Good Hope (in the southernmost part of Africa), Zheng He to Africa is in the middle of Africa, and then to the north, maybe you can't find a sea route to the west.
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Zheng He is a Muslim who has visited the holy city of Mecca; He traveled to the east coast of Africa and found the unicorn, the giraffe; His own value has been realized, the political goals given to him by others have been completed, he doesn't want to preach or plunder**, his physical condition is getting worse and worse, and he probably can't return to his hometown, he leads a public fleet, not a free privateer... His reach to the east coast of Africa is already a legend.
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The reason for Zheng He's voyage to the West is varied, one says to promote the virtue of the Ming Dynasty, the other says to look for Emperor Jianwen, and the "History of the Ming Dynasty: The Biography of Zheng He" provides these two views at the same time, that is, "Chengzu suspects that Emperor Hui died overseas and wants to find traces" and "He wants to show off his troops in a foreign land to show China's prosperity and strength".
There are also theories about outflanking the Timurid Empire, sweeping Zhang Shicheng's old department, solving the problem of military demobilization, obtaining overseas tribute, developing ** to alleviate the shortage of financial expenditure, exploring the possibility of reaching Mecca by sea, and welcoming the Buddha's tooth.
Zheng He's voyage to the West was a sea voyage during the Yongle and Xuande years of the Ming Dynasty, the first voyage began in the third year of Yongle (1405), and the last voyage ended in the eighth year of Xuande (1433), a total of seven times. It was named because Zheng He was the main envoy of the mission, and the fleet sailed to the west of Borneo (the so-called "Western Ocean" in the Ming Dynasty).
During the seven voyages, Zheng He, the eunuch of the Three Treasures, led a fleet from Nanjing, assembled at Liujiagang in Taicang, Jiangsu, and anchored at Taiping Port in Changle, Fujian Province [2-3], and sailed to the western Pacific and Indian Oceans to visit more than 30 countries and regions, including Java, Sumatra, Sulu, Pahang, Chenla, Guli, Siam, Punggara, Adan, Tianfang, Zhofar, Kurumus, Mugudushu and other places, and the farthest known reaches are East Africa and the Red Sea.
Zheng He's voyage to the West was the largest, most numerous ships and seafarers in ancient China, and the longest sea voyage, and it was also the largest series of maritime expeditions in the history of the world before the voyage of the great geographical discoveries of Europe at the end of the 15th century. However, there is still controversy about historical facts such as the purpose of Zheng He's fleet's voyage, the scope of its voyage, and the evaluation of the seven voyages.
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After Zhu Di, the ancestor of the Ming Dynasty, ascended the throne, in order to strengthen ties with overseas and promote national prestige, he ordered Zheng He to lead a fleet to the Western Ocean.
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This is because after Zheng He went to the West, the Qing Dynasty began a policy of closing the country to the outside world, so it never opened up to the outside world again, and it was precisely because of this policy of closing the country that it led to obstacles to foreign exchanges.
The first is because the current technology is not up to standard, the second is because from the perspective of cultural relics protection, and the third is because the Mausoleum of Qin Shi Huang has many institutions that may be unfavorable to archaeologists.