Its history
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1) demographic analysis is the study of population based on factor such as age, race and sex. demographic data refer to socioeconomic information expressed statistically including employment , education, income, marriage rates , birth and death rates, and more.
2) historical sources including , document, artifacts , archaeological sites , features. oral transmissions, stone inscriptions, paintings, recorded sounds, images (photographs, motion picture), and oral history. Even ancient relics and ruins, broadly speaking, are historical sources.
3) Primary sources provide a first-hand account of an event or time period and are considered to be authoritative. They represent original thinking, reports on discoveries or events, or they can share new information. ... Secondary sources involve analysis, synthesis, interpretation, or evaluation of primary sources.
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