It was Qin who led Zhao Tuo and hundreds of thousands of soldiers and civilians south and established South Vietnam. Although this shows that Cantonese originated from "elegant language", it does not prove that "Cantonese is ancient Chinese". For example, at the end of Shang Dynasty, Ji Ji crossed the sea to the Korean peninsula and established Ji Ji Korea. Not being able to speak Korean was the language of Shang Dynasty. The language of the Han dynasty still inherited the elegant words of the pre-Qin period. During the Southern and Northern Dynasties, the elegant words mainly in Luoyang began to change. The elegant language of the Northern Dynasties was mixed with the languages of other nationalities. In the Southern Dynasties, the language of appealing to both refined and popular tastes was combined with wuyue dialect.
During the Sui and Tang Dynasties, the emperor found that languages had become so different that he organized people to write poems. At this time, the elegant language has gone bad, including Jinling and Luoyang, forming Chang 'an Mandarin. Literati of these dynasties, a pure "elegant character" is a must, otherwise, don't think about the imperial examination. In the era of Wu Zetian, there was a cruel official named Hou Sizhi. He didn't read much and came to power by falsely accusing an informant. Therefore, when he was an official, he could speak dialect. Wu Zetian laughed, and Manchu officials looked down on him.
At that time, elegance was influenced not only by China, but also by Japan and Korea, which is why the pronunciation of a word in Japanese and Korean is similar to that in Chinese. There was a hundred years of war in the northern part of Ming Dynasty, and the language was not pure. In addition, Zhu Yuanzhang was from Haozhou, so the same language of Ming Dynasty was "Nanjing dialect".
From this background, we can see that although Cantonese originated from Yayan in the Central Plains, it is not the oldest Luoyang dialect. Luoyang Andrew is also distributed in other dialects. Because the facts are clear, Guangdong is located in the south of Wuling, and there are a large number of ethnic minorities around it. It is normal to mix local languages. Moreover, Guangdong is mountainous. In ancient times when traffic was inconvenient, it was normal to have language isolation.