The Whisky War

Canada and Denmark. Two countries that you'd expect to be relatively peaceful ‚ neither country has that large of a military, and they're both generally on good terms with each other. So why were they both part of a conflict called the Whisky War?
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Notes

• Note [1] — Denmark's not really known for being tall, but it has a high average height, and I didn't really have any other stereotypes about Danes, so that was the best I could do.

• Note [2] — Even though the League of Nations dissolved in 1946, it was a dud following the outbreak of WWII in 1939.
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Image credits

Hans Island: By Toubletap - Own work, CC BY-SA 3.0, https://commons.wikimedia.org/w/index.... Flag map of Denmark: By Kamran.nef - Own work. map from openstreetmap, CC BY-SA 4.0, https://commons.wikimedia.org/w/index.... Hockey Night in Canada: By http://www.brandsoftheworld.com/categ... , colored by me., Fair use, https://en.wikipedia.org/w/index.php?.... Flag of the League of Nations: By This W3C-unspecified vector image was created with Inkscape. - Strictly based on a flag kept by the League of Nations Archives (United Nations Geneva)., CC BY-SA 4.0, https://commons.wikimedia.org/w/index.... Map of Hans Island at the end: Apple Maps, fair use.
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Music

1) Mazurka Op. 24 no. 2 in C major, by Frédéric Chopin. In the public domain, via Wikimedia Commons.
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