Around 1135 CE, this city built its first palisade around the Grand Plaza, but it remains unclear why it was abandoned by 1300 CE. For 10 points each:
[10e] Name this religious center near what is now St. Louis. This city was the largest center of Mississippian culture before its 13th century decline.
ANSWER: Cahokia
[10h] The linked culture of the Mississippian peoples is known by this three-word term, encompassing a shared cosmology and artistic motifs across large areas of the modern U.S.
ANSWER: Southeastern Ceremonial Complex [or SECC; accept Southern Cult]
[10m] The Caddoan site of Spiro in this modern state contained many SECC artifacts in Craig Mound. Present-day Caddo people are primarily based in this state, as are the Pawnee and Kiowa.
ANSWER: Oklahoma
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