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An estimated 1,200 undocumented migrants daily cross the Limpopo River, South Africa's equivalent of the Rio Grande separating the U.S. and Mexico. Most are from Zimbabwe, where shortages of food and fuel and an unemployment rate of more than 80% have sparked a steady exodus to the more stable and more prosperous South Africa. (Getty Images/File)

An estimated 1,200 undocumented migrants daily cross the Limpopo River, South Africa's equivalent of the Rio Grande separating the U.S. and Mexico. Most are from Zimbabwe, where shortages of food and fuel and an unemployment rate of more than 80% have sparked a steady exodus to the more stable and more prosperous South Africa. (Getty Images/File)

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