“The bulk of migrants prefers a short journey to a long one,” he wrote. “The more enterprising long-journey migrants are the exceptions and not the rule.” Southern blacks were the exception. They traveled deep into far-flung regions of their own country and in some cases clear across the continent. Thus the Great Migration had more in common with the vast movements of refugees from famine, war, and genocide in other parts of the world, where oppressed people, whether fleeing twenty-first-century Darfur or nineteenth-century Ireland, go great distances, journey across rivers, deserts, and
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