October 20, 1818 – “The
Convention of 1818 with Great Britain put all of Minnesota including the Red
River valley under U. S. and established the 49th parallel as the U. S.
northern boundary.”
http://www.thehistorypeople.com/data/docs/timeline-part1.pdf
http://www.thehistorypeople.com/data/docs/timeline-part1.pdf
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