The history of the Federation began at the moment the Original Federation was established. From then on, humanity once again had a systematically recorded history.
Prior to the Original Federation, during the Era of the Great Cataclysm, all records could only be found in the fragments of myths from various human tribes and settlements of that time.
These legends, after hundreds and thousands of years of transmission, had already become blurred and chaotic, making it difficult to accurately convey the events that had occurred originally.
Tribes like the Andavi family, which had a stable historical transmission, were in the minority. In the unpredictable Era of the Great Cataclysm, it was hard for people to diligently record history, and they could only rely on oral traditions to document significant events.
And these legends would lose their coherency with tribal migrations and the destruction of Divine Sense, leaving behind just bits and pieces.