C. Migration is the answer
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The human development index parameters are life expectancy, years of schooling, infant mortality rate, maternity mortality rate, people below the poverty line, and per capita income.
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Image result for what missouri compromise admitted as a slave state and a free state
In an effort to preserve the balance of power in Congress between slave and free states, the Missouri Compromise was passed in 1820 admitting Missouri as a slave state and Maine as a free state.
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