This section was added to the post, Great Peloponnesian War on 10th November 2018:
One of the reasons Athens grew to such a size and became rich so quickly was because as they conquered lands, they forced the natives to pay tributes to them.
They also did this with their alliances. A steady flow of money was received through this method. Although Athens had many allies, they are considered more of an Empire than Sparta.
The Augustus 