Why did they call coffee a cup of joe?
One theory holds that coffee came to be known as joe, because joe itself is a slang term for a common fellow, guy, or chap. In other words, coffee became a cup of joe because it was considered the common man's drink.
Although nobody knows for sure, it is speculated that the term Cup of Joe stems from a ban on alcohol on U.S. Navy ships in 1914 by Secretary of the Navy Josephus "Joe" Daniels. After that order, near the beginning of World War 1, the strongest drink a sailor could get on a ship was black coffee.
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