John Gilbertson was born in Winnebago county, Illinois.

The evidence

• “John Gilbertson was born in Winnebago county, Illinois, on December 7, 1860. He was the son of Jacob Gilbertson, who came to this country from Norway some time during the fifties and settled in Illinois, where he followed the business of farming for a number of years.”

  1908-brown-rock-county/34c-biographical-3.md, Vol. 2, PDF p. 460 / book p. 948

  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.

  Grade A: Found on a page of one of our sources