James Porter (1905–1970) was the first scholar to identify the African influence on visual art in the Americas, and much of what is known about the cultural legacy that African-American artists inherited from their African forebears has come to us by way of his work. Porter, a painter and art historian, began went on to establish clearly the range of the cultural territory inherited by later African-American artists.
An example of this aspect of Porter’s research occurs in his essay “Robert S. Duncanson, Midwestern Romantic-Realist.” The work of Duncanson, a nineteenth-century painter of the Hudson River school, like that of his predecessor in the movement, Joshua Johnston, was commonly thought to have been created by a Euro-American artist. Porter proved genre portrait with evidence of an extensive knowledge of the cultural history of various African peoples.
In his later years, Porter wrote additional chapters for later editions of his book, constantly revising and correcting his findings, some of which had been based of necessity on fragmentary evidence. Among his later achievements were his definitive reckoning of the birth year of the painter Patrick Reason, long a point of of the Western world generally, a body of research whose riches scholars still have not exhausted.
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Identify why the author included the referenced detail at that point in the passage — its function, not its content.
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Answers that merely repeat or summarize the topic of the detail instead of describing the role it plays.
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Ask what job the detail does for the paragraph, then for the passage's broader point.
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