The development of agriculture changed the way people lived because they had to grow their own food.
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I believe it would be A. and C.
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Institute a massive system of capitalism, sustainable innovations, and government policies that follow partial censorship to illusion the public into thinking the nation is in a democracy.
There were quite a few reasons. Allthough Alexander the Great already conquered was amounts of territory in Asia minor and Egypt, well outside the borders of Greece, there were always more riches to be found in different nations, together with bigger glory. As he was a general and a war-hero, it was important for him to obtain as much land as possible.