Believe it or not, all 70 kingdoms used to belong to one empire. However today the only thing left of this once big empire is now nothing but, a fossil and mysteries.
There are multiple theories on how the empire has fallen.
civil warfare theory states it's was caused because of there was a civil War and individuals used there advanced technology to kill each other.
The giant theory states that giants and humans went to war with each other.
The pollution theory states that ρύπανση are the ones that caused the fall.
However what answer maybe I don't think any time soon will get the answer.