Why did the Greeks establish colonies outside of mainland Greece?

The Greeks began founding colonies as far back as 900 to 700 B.C.E. These colonies were founded to provide a release for Greek overpopulation, land hunger, and political unrest. Iron tools and new farming techniques allowed the Greeks to farm larger pieces of land.

the following best describes postwar era writers in their works:

progressive

many writers,authors,novelists,poets concentrated more on social art and social writing and stayed away from political writings.