Cause Greek city states are near the Mediterranean Sea what’s the effect

The reason why most big Greek cities are located near the sea is because big part of Greece's economy comes from trading. Greece produces a lot of things in the factories close to the big cities so they need ports close by. Also a huge part of Greece's economy is supported by tourism and the sea is something that attracts more tourists. It's important to know that Greece doesn't have a really good economy so being in the Mediterranean is really helpful.

sense of self-interest