There are many events that others have given as their idea of when the war changed course, i.e. Atlanta, Forts Henry and Donelson, Antietam...etc, etc.
see...
http://en.wikipedia.org/wiki/Turning_point_of_the_American_Civil_War
I guess for myself anything that I can blame on Bragg I'll take, its a weakness :)
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David Upton