When was the War of 1812?
This sounds like a trick question but the actual date of a major conflict between two nations is often disputed. In this case, "the process of naming the War of 1812 for its year of commencement, even though it lasted into 1814, developed slowly through the 19th century," according to the Canadian Encyclopedia. (http://www.thecanadianencyclopedia.com/articles/war-of-1812)
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