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Disadvantages: Some primary sources, such as eyewitness accounts, may be too close to the subject, lacking a critical distance. Others, such as interviews, surveys, and experiments, are time consuming to prepare, administer, and analyze. Primary sources help students relate in a personal way to events of the past and promote a deeper understanding of history as a series of human events. Because primary sources are incomplete snippets of history, each one represents a mystery that students can only explore further by finding new pieces of evidence.
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I think they wanted communism or finish unresolved global conflict
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There were more deaths in WW1 than the Napoleonic wars because of new technology. Some of the technology used were tanks, submarines, and machine guns. Because of this more deaths occurred because the technology was more advanced and easier for soldiers to use. Trench warfare was also used in WW1.
Explanation:
I used google to find this
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The 13th amendment finally abolished slavery