"Visitors to the American Civil War Center, located in a Civil War-era artillery factory, say its approach is also eye-opening.  Roberta Herron of Minneapolis said she felt tricked by history books she read growing up in the ’60s.  “I was always raised to believe that the north had always intended to free the slaves and, as you go through here, you realize that wasn’t the case - that it was almost by accident that it happened,” said Herron."