Too much to go into here but READ about it and much of what their symbolism represents will be understood. Read about the civilization that PRECEDED the Mayans and the Aztecs in S. America. Their god, Quetzalcoatl was a FEATHERED SERPENT and they practiced human sacrifice/cannibalism.
the word AMERICA comes from an Incan word meaning: THE LAND OF THE FEATHERED SERPENT
Also, the IRON EAGLE symbol that the Nazi's used ALSO appeared in HITTITE archeological digs.
IT HAS a meaning related to even earlier civilizations.