Slave labour was restricted largely to domestic service. Rural wage rates were depressed owing to the caste system and the “village community” mechanism. In the city, the monopoly of resources by the ruling class necessarily depressed wages through the market mechanism itself.
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the answer is d sharecropping
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This means that no matter whether poor or dark coloured, all men are equal
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Technology is very needed in cold war. For example spy plane and nuclear.If nuclear doesn't exist, maybe the cuba would be invaded by the USA, and if spy tech doesn't exist, maybe the cold war would be a full blown war, between Nato and Warsaw Pact in Europe (WW3)