Why did Greek colonization become necessary by the 8th century BC?

Why did Greek colonization become necessary by the 8th century BC? Why was Greek colonization possible by the 8th century BC?

Its necessity is explained by the fact that by that time ancient Greece was no longer hindered by large-scale wars or invasions, the growth of economic components began, which led to an increase in population. This became the reason that the land on the Balkan Peninsula, where Hellas was located, could no longer feed all its inhabitants, and a land hunger began. Thus, the Greeks began to look for other places favorable for life, which began the colonization. It allowed her to carry out the fact that the Greeks developed a normal maritime business.