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The American educational psychologist, Benjamin Bloom, carried out research that showed that a "decade of dedication" is more important than giftedness in achieving success in a given field of learning (read more)
Earth lodges are well-known from the more sedentary tribes of the Plains, such as the Hidatsa, Mandan, and Arikara (also known as the Three Affiliated Tribes) who lived primarily in earth lodges and using tipis as temporary shelter while traveling from their villages or on seasonal bison hunts, but they have also been identified archaeologically among sites of the Mississippian culture in the Eastern United States.
The construction of earth lodges as housing had both practical and spiritual aspects. They provided shelter, with the earth covering acting as insulation, and the supporting posts gave strength to the roofs such that people could gather on top of their houses in good weather. Many aspects of their construction also reflected the beliefs of the people, maintaining a close connection between their lifestyle and their mythology, ensuring the passing on of beliefs to the next generation.
The Union victory resulted in the abolition of slavery and consolidation of the Union. Yet full equality for African Americans would wait another century, until the fruits of the Civil Rights Movement. For good or ill, preservation of the Union enabled the United States to emerge as a major world power in the closing years of the nineteenth century. Had a Confederate victory split the union, and the United States not achieved its resulting productivity, military capability, and wealth, twentieth-century history would have looked very different.