Since the Zhou Wu king made the ceremony, the four sides of the Central Plains have been divided into foreign tribes, and the "Li Ji Wang System" records: Eastern Yueyi, Western Yuerong, Southern Yueman, and Northern Yuedi. During the Spring and Autumn Period, the princes competed for hegemony, and Confucius proposed to honor the king and carry forward the great righteousness of culture, so as to distinguish between Huaxia and barbarians, which is called "yixia distinction" in history.
However, in the Qin and Han dynasties, the four barbarians began to integrate into the Central Plains, during the Han Dynasty, the Hu people began to move to the Central Plains, entrenched in north China, the strength continued to grow, by the Western Jin Dynasty, the Hu people have entered Guanzhong and Jingshui, Weishui River Basin, the Western Jin Dynasty capital Luoyang formed a siege.
After the rebellion of the Eight Kings of the Western Jin Dynasty, the Jin Dynasty split, the national strength was empty, the Hu people took the opportunity to raise troops, invaded the Central Plains, and in more than a hundred years, more than ten regimes were established by the Hu and Han people, this chaotic world is also called the "Five Hu Rebellion", there is also a "Five Hu Sixteen Kingdoms", the long-term war has made the Han people almost suffer a disaster, and the Han people have also begun to absorb the rest of the nationalities to continue to develop.
Therefore, today's Han people, the vast majority are not pure Han people, people usually refer to the pre-Qin Period of the Chinese people as the purest Han people, now living in Fujian Hakka, is the only remaining pure Han people, Hakka is also the Han in the world's most widely distributed, the most far-reaching ethnic group.
Nowadays, the Hakka have only 100 million people, but the purest Fujian Han people are only about 25 million, the rest are scattered around the world, the origin of the Hakka and the pre-Qin period, after Qin Shi Huang unified the world, the Hakka people appeared for the first time in history, but Qin Shi Huang in order to consolidate the southern territory, sent a large number of soldiers and civilians.
The Hakka of the Lingnan generation, in order to avoid the chaos of war, began to move, but this was only a small relocation, the real large-scale relocation, was in the Western Jin Dynasty "Eight Kings Rebellion", the northern Xiongnu, Xianbei, Xianbei, Qi, Yu took advantage of the void, the Han people who could not bear the war, began to move south.
They moved along the Han River into the Yangtze River into Hubei, Anhui, Jiangsu generation, the Eastern Jin Dynasty in order to resettle the Central Plains immigrants set up overseas Chinese, counties, counties, give a variety of preferential treatment, a great atmosphere of immigration, lasted for more than 170 years, but the third migration, really laid the Hakka system.
In 112 AD, the Jin soldiers attacked the Northern Song Dynasty's Kaifeng, song Gaozong crossed south, announced to the world in Lin'an (Hangzhou), ascended the throne, established the Southern Song Dynasty regime, followed Zhao Zhao to move south with up to a million Han people, when the Yuan soldiers pushed south, the Hakka people living at the junction of Gansu, Fujian and Guangdong joined the army, and the local praise for the Hakka: "Male cadres, female armor, eight thousand sons and daughters to go to the king."
Some of the Hakka people seeking stability continued to move south and enter the Guangdong area, when the household registration had begun to appear "lord" and "guest", these people called themselves "Hakka" after entering Fujian, and the fourth and fifth times after that occurred during the Qing Dynasty, the entry of Qing soldiers into customs and the Taiping Heavenly Kingdom Movement in the late Qing Dynasty.
Nowadays, the Hakka people in Fujian who have settled down have become the only pure Han Chinese, their language is determined to be the purest Chinese, we also call it Hakka, compared to Chinese, Hakka is obscure and difficult to understand, but the language is good, the Hakka migration is not only the Central Plains, the descendants are all over more than 80 countries and regions.
As the saying goes, "Wherever there is seawater, there are Chinese, and where there are Chinese, there are Hakka."