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Connecting past and present helps you see how humans have chosen to deal with conflict, which can lead to war, political debate, neighborhood riots, discrimination, etc. But also linking past and present helps us see how humans have solved any problems they have come across. Whether it be an economic issue, something that effects many people, or a personal issue.
Expanded trade, regional empires, and increased global trade are all effects of which of "<span>b. the transition from river valley civilizations to classical civilization," since classical civilizations engaged in more far-reaching trade and cultural diffusion. </span>
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A. To ensure that the government has little power as possible