Plato Had Access to a Phenomenal Data Set

There were over a thousand Greek city states across the entire Mediterranean and Black Sea regions. Even though we have hardly any information about like 90% of them, that doesn't mean Plato didn't have information about them. In terms of the number of states he could have studied, Plato had access to a larger data set than we do today. Maybe that's why the Greeks produced so much political philosophy because they had so many states to study.