Upon looking around a bit I found that another student asked the same question. Their question was answered by the Brainly user Neuron and was voted by people who work at Brainly as a certifiable answer. This was his answer:
"The single most significant characteristic of Greece is the uneven terrain and how mountaineous it is. Because the landscape of Greece if full of mountains, this led to the development of smaller city states, where the different cities never had much contact in the sense of forming a greater Greek nation. They did trade and waged war, but not much more. "
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https://brainly.com/question/1724430
