D?
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A historian might use periodization in order to separate the different cultural and political movements in Ancient Greece. It's a good way to categorize and organize the vast history of Ancient Greece, in order to make it more easily understandable. It's also a good way to examine differences in ideals and culture shifts across time.
Although there were great physical and financial risks associated with colonization, the rewards in terms o resources and land power were immense, so most nations were willing to try.
