Answer:
It's large size, which made it difficult for the Union to conquer.
Plato was probably talking about a Democratic government which is composed of several leaders that are in-charge of particular cities and communities in a country. During his time, Plato is a known philosopher who spent his time discussing with people in plazas and squares arguing about almost anything under the sun.
Answer:
Both were powerful soldiers and engineers. Both had a king and a rigid social structure. Both were deeply influenced by outside civilizations.