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Explain the impact of the end of slavery and the civil war on former slaves and people living in the south

Chen's research team randomly assigned some newborns and their mothers either to a breastfeeding promotion group (where breastfeeding was encouraged, but not required) or to a normal pediatric care group (where breastfeeding was neither encouraged nor discouraged). which research method did they use?

Among the many crucial themes related to politics, a central idea of politics includes the existence of