In the history of the world, until the end of15th century, there was no record of corn in any country. Therefore, it is certain that corn spread to all countries in the world after Columbus discovered America in 1492.
In the middle of Ming Dynasty, maize was introduced to China in 153 1 year. Less than forty years after Columbus discovered America, corn was first introduced to China in Guangxi. By the end of the Ming Dynasty, it spread to ten provinces including Hebei, Shandong, Henan, Shaanxi, Gansu, Jiangsu, Anhui, Guangdong, Guangxi and Yunnan. 18 and 19 centuries, China planted corn on a large scale, which greatly eased the food pressure at that time.
At the same time, in the sixteenth and seventeenth centuries, corn was introduced to Africa, southern Europe and other parts of the world, and it was also widely valued. Nowadays, corn is an important food crop, and it is also a traditional rice and wheat. Corn is also an important feed source for animal husbandry and aquaculture.