For @patrickc's Fast, the telegram. IMO the striking part isn't construction time, but the speed that congress approved money.
1838 Morse sought sponsorship, but denied.
Dec 1842 he wires 2 rooms in the capital to demo.
Mar 1843 Congress approves $30K to build a 38-mile demo 
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Sources History of the Baltimore and Ohio Railroad by Stover, p 59-60 Worldwide History of Telecommunications by Huurdeman p 61 Also this may have been the first time the US Congress paid out to support private research, unless you count Lewis and Clark: http://maryannfeldman.web.unc.edu/files/2011/11/Economics-of-Sci-and-Tech_2002.pdf …
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