Well, there was no such thing as "Chinese nation" in ancient times, that is to say, the Han people did not regard other ethnic minorities as equal and unified nations, but regarded ethnic minorities as aliens or vassals and barbarians, so there was no poem describing the so-called "fifty-six ethnic groups are one family" in China's ancient poems.
The concept of the Chinese nation came into being after the overthrow of the Manchu Dynasty and was established after the founding of New China.