To keep information a secret, So they tell limited amount of people.
In Spartan households, Men held more power than the Women, and total obedience was required for the Women.
Spartan really Value Strength (all of their boys already taken for military training from a very young age). Since women is naturally weaker, they believe that Men were the one that should lead the city
hope this helps
The Roman Empire survived more because it had economic stability. Its provinces produced food and other goods, carried out trade that brought wealth and also paid taxes. The empire was also well protected.
