But before the concept of Beastman was solidified, these races couldn't possibly form a single group.
Just as various beasts can't become one tribe.
For example, wolves and rabbits—do you expect these two races to form a community?
It's utterly unreasonable and doesn't conform to the rules of Nature.
Yet Beastmen themselves are not naturally born; carnivorous Beastmen also eat greens.
Herbivorous Beastmen also enjoy meat.
Essentially, Beastmen are merely human sub-species with animal traits, not beasts.
The first generation Beastman King unified them as Beastmen based on their animal characteristics and, using his talent and ability combined with the global situation at the time, successfully grouped most Beastmen into one race.
He established the Beastman Empire.
This is the origin of the Beastman Empire.
Not all beast-like races joined this group.
Like Minotaurs, Centaurs, and Snake-men.
