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1325 A.D. Aztecs They accomplished draining the swamps

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1325 A.D. Aztecs They accomplished draining the swamps

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1445 A.D. Aztecs accomplished making the dikes

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1445 A.D. Aztecs accomplished making the dikes

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3rd Century BCE Mayans develop system of writing

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3rd Century BCE Mayans develop system of writing

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mid 15th century incas make roads and bridges

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mid 15th century incas make roads and bridges

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mid 15th century incas make roads and bridges

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32,000 B.C. incas made the lunar calendar

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32,000 B.C. incas made the lunar calendar