What is one contrast between aztecs and the incas

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The Incas were a gentler people, whose accomplishments lay in other fields. For instance they had an excellent system of roads and a very adept messenger service. This helped them maintain order in the largest empire in the Americas. The Aztecs did have a system of courts.

i think it's either 'to expose the corruption of the communists in russia', or 'to criticize animal brutality by communists in russia.'  

hope this ! : )