Further looking into Blackburne's quote – "1.e4 e5 2.Nf3 Nc6 3.Bc4 Bc5 4.Bxf7+ Note - I used to call this the Kentucky opening..." – (see "The Kentucky Opening (Part 1)") I found another reference in the September 1875 issue of the Dubuque Chess Journal.
GAME NO. 513 (Kentucky Opening.)
Contested lately in Danville, Kentucky.
Fields - J. K. Young
1.e4 e5 2.Qh5 Nf6
3.Qxe5+ Be7 4.Bc4 0-0 5.d3 Re8 6.Qg3 d5 7.Bh6 Nh5 8.Qf3 g6
The game was already won, and the move was made to tempt the adversary to capture the pawn, thereby permitting a very neat and pretty ending.
9.Bxd5 Qxd5 10.exd5 Bb4+ 11.K moves R mates
Later in the same issue of the Journal, was this news story:
...A lively Chess Column has also just been inaugurated in the Lebanon (Tenn.) Herald. As an exponent of Southern and South-Western Chess doings, its influence will be great. The Lebanon Chess Club is at present conducting several telegraphic games with Ohio, Tennessee and Mississippi Clubs, and will soon be heard from, having already won a fine "Kentucky Opening" from Nashville...