The Industrial Revolution increased the overall amount of wealth and distributed it more widely than had been the case in earlier centuries, helping to enlarge the middle class. However, the replacement of the domestic system of industrial production, in which independent craftspersons worked in or near their homes, with the factory system and mass production consigned large numbers of people, including women and children, to long hours of tedious and often dangerous work at subsistence wages. Their miserable conditions gave rise to the trade union movement in the mid-19th century.
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