How did Cantonese come into being?

Cantonese is produced by Hakka dialect. I don't believe my Baidu medieval video, which is exactly the same as Hakka dialect. Middle ancient Chinese belongs to Hakka-Jiangxi language family, which is similar to Fujian language reading.

Ancient Chinese produced early Middle Chinese.

In the early Middle Ages, Chinese produced Min language, while in the late Middle Ages, Chinese produced everything: Cantonese, Wu language, Mandarin and so on.