The last post at freerepublic suggested that fire brought down Cahokia
Epic Fire Marked ‘Beginning of the End’ for Ancient Culture of Cahokia, New Digs Suggest
http://www.freerepublic.com/focus/chat/3128274/posts
Well the flood would have been real useful..... : )
The fire was in a satellite town or “suburb” 10 km away; the main mound city where the huge Monk’s Mound is was not burned.
Still, that burned compound to the west was very important for some reason, as was the Emerald Mound complex to the east.