To record events.
To communicate.
To keep track of trade
The main reason the Sumers were great was because they were the only civilization at the time. They were the only people at the time to have writing.
As the system developed, it became very corrupt
To simplify written communication and record keeping.
The main reason is most likely relious-based bigotry.
Governing an expansive empire demanded it.
They needed a way to make and keep records.
The reason that India isn't a developed country no matter how rich they are is due to the reason the government do not share there money out.
the fertile river valleys which favord agriculture.
they developed agriculture
to survive
Addiction