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They were grown and harvested by slaves, or enslaved people.
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The Mexico–United States barrier is a series of vertical barriers along the Mexico–United States border aimed at preventing illegal crossings from Mexico into the United States.
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The correct option is B.
The second industrial revolution occurred between 1870 and 1914. During this period, there was massive advancement in technology and in factories and this made it possible for manufacturers to produce a lot of goods en mass. The industrial revolution started in Britain and rapidly spread to Europe and North America an then to the rest of the world.
