The best replacement for aztecs is incas.

The best alternatives to aztecs are rated as following:
★★★★★  incas
★★★★  mayans
★★  spanish
★  lobos
★  spaniards
★  mongols
★  cortez
  mayas
  wildcats
  egyptians
  spanish conquistadors
  incas first
  conquistadors
  cortes
  mayan
  incas mayans
  mayans first

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Speaking about aztecs, one probably shouldn't forget about hernan cortes.

Other search terms related to aztecs and their ratings are:
★★★★★ hernan cortes
★★★★★ incas
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Google Trends

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aztecs
incas
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