A county named Chippewa was formed from the northern portions of Michilimackinac, including the southern shores of Lake Superior and, within its southern boundary of 46° 31' north latitude, all the territory of the present State of Wisconsin bordering on Lake Superior.

The evidence

• “Green Bay, of Brown county. On the 22d of December, 1826, a county named Chippewa was formed from the northern portions of Michilimackinac, including the southern shores of Lake Superior throughout its entire length, and extending from the straits leading from that lake into Lake Huron, west to the western boundary line of Michigan Territory, with the county seat " at such point in the vicinity of the Sault de Ste. Marie, as a majority of the countj' commissioners to be appointed shall designate." Embraced within this county, — its southern boundary being the parallel 46° 31' north latitude, — was all the territory of the present State of Wisconsin now bordering on Lake Superior.”

  1879-history-of-rock-county/01-wisconsin-antiquities-indians-territory.md, PDF p. 33 / book p. 37

  Butterfield, C. W., et al. The History of Rock County, Wisconsin: its early settlement, growth, development, resources, etc. Chicago: Western Historical Company, 1879. Cornell University Library via the Internet Archive, archive.org/details/cu31924028871585.

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