John Henry (spy)
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For other people named John Henry, see John Henry (disambiguation).
John Henry (c.ā1776 ā 1853) was a spy and adventurer of mysterious origins. He sold documents called the Henry letters to the United States suggesting treason by Federalists on the eve of the War of 1812 with Great Britain. The Henry letters helped build outrage against Britain which led to the United States declaring war in June 1812.