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Historians use things such as primary soursces like fossials, Artifacts and documentary evidence. Evidence that a historian uses to study is the written record. Historians use data collected by governments to study what the world was like in regards to numbers and records.
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The pyramid builders were not paid in money because it wasn’t invented then. Instead they paid them in a different way by giving them food, large quantities of beer, a place to live in, they could choose too be a priest for a day and even healthcare
It did not let us trade with Britain and France, until they stopped their fighting/attacking American ships. It also said that we would resumed trade with the country that traded back without incident