Because they were different from the other city-states, and they had a different government system.
Kept poor people from serving the state. Imitated the laws of its neighbors. Treated all its people fairly regardless of class.
Samuel Slater
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Today we trade (aka imperialism) by paying , or going into stores , this is different from back then because we use to just give each other items in exchange for something or to learn something.
Imperialism is just another word for trade really.
i really hope this helps you a lot. :)
Christianity, decadence, the metal lead in the water supply, monetary trouble, and military problems caused the fall of rome.