What do you mean by going west?

One of the five major immigration events in China's modern history.

According to Baidu Encyclopedia, westward movement is one of the five most famous migration events in China's modern history. In the long history of more than 400 years from the mid-Ming Dynasty to the early Republic of China, countless Shanxi people, Shaanxi people and Hebei people left their homes, which opened up the economic and cultural channel between the hinterland of the Central Plains and the Mongolian grassland and promoted the prosperity and development of the northern region. This is a bitter history of immigration, but also a history of hard struggle and entrepreneurship.

Xikou, in a narrow sense, refers to the mouth north of the Great Wall, including Shahukou in Shanxi; Fugukou, Shaanxi; Dushikou, Hebei Province, is the intersection of people from northern Shanxi, northern Shaanxi and Hebei Province moving westward. Houxikou generally refers to the place where Mongolia engages in agriculture and commodity trade north of the Great Wall, including Shenmukou in northern Shaanxi, Zhangjiakou and Guihuacheng in northern Hebei (now Hohhot).