November 16, 1826
John P. Watson was born in Cambridgeshire, England.
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The evidence
“John P. Watson, one of Janesville 's successful contractors, and a resident of that city since 1855, is a native of Cambridgeshire, England, was born November 16, 1826. His parents, William and Mary (Spinks) Watson, were also natives of England.”
1908-brown-rock-county/34b-biographical-2.md, Vol. 2, PDF p. 420 / book p. 911
Brown, William Fiske, editor. Rock County, Wisconsin: A New History of Its Cities, Villages, Towns, Citizens and Varied Interests, from the Earliest Times, Up to Date. Chicago: C. F. Cooper & Co., 1908. 2 vols. archive.org/details/rockcountywiscon01brow, archive.org/details/rockcountywiscon02brow.
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People: John P. Watson