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An achievement is when you discover and do something great. It states on Oxford Languages, "a thing done successfully, typically by effort, courage, or skill." This information was gathered from "World History: Medieval to Early Modern Times".

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The Incas invented the quipus as a sort of written language. Quipus were cords, and the knots in the cord represented numbers. They would use different colored cords to sort them by subject. This was how they kept records of things. On page 424 of the textbook was where this information was found.

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The Incas also made sturdy masonry (Another word for stonework). They were able to make such high quality stone blocks, it would be nearly impossible to fit a knife blade between the blocks. They did this by cutting the blocks so carefully, they wouldn't even have to use cement to glue them together. Some Inca buildings are still being used today,the quality of the buildings were that good. The source of this information was found in the textbook on page 430.

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A third thing that the Incas achieved and were famous for was making textiles. A textile is a wool sheet that is colored and has designs. The Incas were able to make amazing textiles that have lasted in excellent condition to this day. The facts stated here were found in the textbook on page 430.