Answer:
Invasions by Barbarian tribes
Western Rome's collapse pins the fall on a string of military losses sustained against outside forces. Rome had tangled with Germanic tribes for centuries, but by the 300s.
Athens held the advantage during the Peloponnesian War.
Pros: Gave more jobs to people
Production of goods
People had access to cheaper goods and better education
Cons: bad quality working condition
Pollution
Overpopulation
