Why did Greek colonies spread throughout the Mediterranean region?

Greeks were sailors and explore because of the overpopulation in Greek so they are set in the nearby area and spread throughout the Mediterranean region.

Explanation:

The Greeks were the active seafarers as they were to make trading with the people. They made the trade with the near area which is the Mediterranean region.

Because of good trading routes the Mediterranean also travels to Greece. The conquest of Alexander leads to the spread of Greek culture. Even thee Greece was gone its culture spread throughout the world.