Although both of them were Mediterranean counties, their geographic locations were somehow different from each other. On one hand, the Greeks’ city states separate by hilly country sides, so their borders were somehow protected. On the other hand for the Romans, their locations were mostly inland and were surrounded by mountains, north Alps and east by Apennine. For some reason, most of civilizations located near water. Greeks and Romans shared this common characteristic. The Alexander’s empire expanded Greeks’ territory and has contact with the Mediterranean Sea, Black Sea, Caspian Sea, and Arabian Sea. Because of the inland location of Rome, the water systems they based on were rivers as well as seas, mainly the Tiber River and the Tyrrhenian Sea. Therefore, Rome was exposed to migrations and invasions.
Ancient Greece had no central authority at the time of the individual self-governed city states. As a result, wars and battles sometimes were fought among the city states. For example, the Peloponnesian War (431BC~