It was repeated in 1945 outside of Bad Kreutznach Germany, where we kept the German PWs. It was rough for them but not as bad as Andersonville.
In my opinion this is not an anniversary worth celebrating.
It sounds like the treatment of prisoners was very much dependent on the whims and attitudes of whatever ranking officer was in charge at any given time. Another problem was the lack of resources in the south.
In Chicago (Fort Douglas?) was a prison camp that started out being extremely lax with confederate prisoners wandering the streets of Chicago. Over time the place became extremely harsh due to the rising prison population and attitudes of the commanding officer.
http://www.angelfire.com/ga2/Andersonvilleprison/wirz.html
"Wirz last words reportedly were that he was being hanged for following orders."