Complete the sentence about Oklahoma with the correct year: Spiro Mounds, in what is now Spiro, Oklahoma, was a major Mississippian mound complex that flourished between AD 850 and ______.

Answer and explanation

Correct answer: C. 1450

  1. Step 1: Spiro Mounds, in what is now Spiro, Oklahoma, was a major Mississippian mound complex that flourished between AD 850 and 1450. Answer: 1450. Why not the others: 1458, 1480 and 1435 don't fit.

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