Yeah - please correct me if I'm wrong: I watched a documentary on it called: "The Money Masters: How International Bankers Gained Control of America." That was the impression I got from it.
edit: http://www.youtube.com/watch?v=cIjxXEZyhzU 1:25:00 - bankers were originally opposed to the greenback, and also Lincoln's efforts to remove the debt based system that had to be introduced to fund the war when the greenback failed -- the bankers wanted a gold-backed currency. (look at 1:18:00 onwards for full background)
