lThe Aztecs and Incas found their military power less effective against nomadic frontier people; their empires
were based on conquest and
exploitation of sedentary peoples.
lThere were considerable differences between Incas and Aztecs, many of them the result of climate and geography.
lTrade and markets were more developed among the Aztecs.
lOther differences were present in metallurgy, writing systems, and social definition and hierarchy.
lIn the context of world civilizations both can be viewed as variations of similar patterns, with sedentary agriculture as the most important factor.