Historians look for causes and effects that help to explain how and why events happened. They try to see the past through the eyes of the people who lived it. When they study the past, historians ask themselves questions. The answers to the questions help historians draw conclusions about the past.
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By leaving behind artefacts and objects which could lead into bigger historian events.
If you can understand all the trends and mistakes humans have made, history can help us by preventing making the same ones. We could understand how we do things and the purpose for doing them... read a lot of books and stay in school.
genocide
Because without coins the empires would not get bombs and all
because it would help us understand about the war and so we would not "repeat history."