Next we will be reading how NASA purchased 20,000 semi-automatic weapons and 10 million rounds of ammunition.
Near as I can tell that stratification was already in place when the society started.
Roman: Aristocrats and plebs
Babylonians: Aristocrats and everyone else
Egyptians: Pharaohs and everyone else Mongol hoard: Warriors and everyone else... Etc, etc and, of course, etc. What fueled their rise may have contributed to their downfall but it was usually someone with a better organizational model who came along and knocked them down. even if that model was similar and was carried out with more passion.