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Southern cities were small because they failed to develop diversified economies. ... In 1860 the North had approximately 1.3 million industrial workers, whereas the South had 110,000, and northern factories manufactured nine-tenths of the industrial goods produced in the United States.
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It looks like children working in a coal mine so i guess Gases, Mines could collapse, and possibly get sick from fumes or something.
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it would be sentance 3 or you can call it 3 hope it helped :)
From 1300s to 1500s, which is about two centuries, Japan tore itself apart in the feudal wars and all the civil conflicts. Due to Minamoto's victory, Japan transitioned to medieval feudalism and power rested upon two shogun regimes, the Kamakur and Ashikaga.
