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Anonymous
Venn diagrams were introduced in 1880 by John Venn in a paper entitled On the Diagrammatic and Mechanical Representation of Propositions and Reasonings.
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It was invented in July 1880
I think it would be pretty safe to say he invented the Venn Diagram
No country was ever a Venn diagram.
No a venn diagram is not a graphic source.
John Venn.