Because there was either less supplies or more supplies where there was trade.
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Explanation: The fundamental reason for the US entry into WWI was the fact that the US had strong economic connections to Britain
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The Great Wall of China was built as a military defensive line to defend the invasions from some northern nomadic nations. Apart from the function of defense, the wall also boosted the economy, as well as promoted the culture exchange and national integration of different nations at its two sides.
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oh hey I have the same question as u good luck u don't know the answer either
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the greatest extent of the monogol empire