The Song Dynasty was prosperous in many respects of the society. In agriculture, the productive technology was improved which promoted the output of food; in handicraft industry, the division of labor became more detailed which made the handicrafts technology reach an advanced level; additionally, the development of the commodity economy exceeded the previous level. Particularly, the earliest paper currency appeared at that period.
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World War II (often abbreviated to WWII or WW2), also known as the Second World War, was a global war that lasted from 1939 to 1945. The vast majority of the world's countries—including all the great powers—eventually formed two opposing military alliances: the Allies and the Axis. A state of total war emerged, directly involving more than 100 million people from more than 30 countries. The major participants threw their entire economic, industrial, and scientific capabilities behind the war effort, blurring the distinction between civilian and military resources. World War II was the deadliest conflict in human history, marked by 70 to 85 million fatalities, most of whom were civilians in the Soviet Union and China. It included massacres, genocides including the Holocaust, strategic bombing, premeditated death from starvation and disease, and the only use of nuclear weapons in war.
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Answer: prevent Southern soldiers from selling captured African American soldiers
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