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With these materials they created necklaces , woven mats , and exquisite carvings . What remains of their culture today are huge burial mounds and earthworks . Many of the mounds that were opened by archaeologists contained artworks and other goods that indicate their society was socially stratified . Perhaps the largest indigenous cultural and population center in North America was located along the Mississippi River near present-day St. Louis . At its height in about 1100 CE , this five-square-mile city , now called Cahokia , was home to more than ten thousand residents ; tens of thousands more lived on farms surrounding the urban center .
Please check all the words that can be used instead of the target word in the same context. Note that the morphology of the target (third person singular, past tense etc.) is considered to be applied to the candidate automatically in the process of paraphrasing.