Numerous historians, including coffee history specialists stick with the WWII origin. Indeed, http://atwar.blogs.nytimes.com/2013/08/16/the-marines-secret... *provides a picture of a Marine drinking an "Americano" style coffee in 1944 and documents the role of coffee in the US Military back to at least the civil war. See also http://www.vanhoutte.com/en-ca/c-the-coffee-blog/coffee-cult....
Numerous historians, including coffee history specialists stick with the WWII origin. Indeed, http://atwar.blogs.nytimes.com/2013/08/16/the-marines-secret... *provides a picture of a Marine drinking an "Americano" style coffee in 1944 and documents the role of coffee in the US Military back to at least the civil war. See also http://www.vanhoutte.com/en-ca/c-the-coffee-blog/coffee-cult....