The copper mace is a most remarkable object however it was used. This picture of an aztec ceremonial knife was very graciously lent to the Royal Academy London for the exhibition "Aztecs" a few years ago by the Museo National de Antropologia Mexico City. The British Museum also has a spectacular example covered in turquoise and other stones but I prefer this example. Acts of cannibalism could be straying a little off subject but it is still worth mentioning. Ritual cannibalism has been found quite far into present day USA. I have not read anything to suggest cannibalism as a supplement to the staple diet in the Americas. I have not read that the sacrifices in the Aztec empire were in any way linked to sustenance except in a spiritual manner for the priesthood. It seems to have been worldwide historically. Even in fairly modern times in the South Pacific I am not sure there is strong evidence that cannabalism was like pork chop night at the Simpsons
. However the practise has produced many of the worlds most outstanding art. IMHO