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The largest mound covered fifteen acres . Cahokia was the hub of political and trading activities along the Mississippi River . After 1300 CE , however , this civilization declined - possibly because the area became unable to support the large population .
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.