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Step-by-step explanation:
World history is an account of the past, looking at it on a world scale. The world history is dated thousands of years back and is such a wide and deep subject.
A historical theme is an interpretative work that uses evidence from several different sources and eras to support it. Evidence is information that helps in making statements or conclusions about historical events. Historians refer to evidence as sources.
There are two types of sources. The primary sources which are records of past events by people who lived at the time and experienced them, and secondary sources which are documents created later by scholars.