The most powerful of the Andean states between 900 and 1465 following the decline of Tiahuanaco and Huari was AP World History Chapter 11 The most powerful of the Andean states between 900 and 1465 following the decline of Tiahuanaco and Huari was a. Chavin. b. Texcoco. c. Titicaca. d. Chimor. e. Chichen Itza. Answer: D Learn More : Share this Share on FacebookTweet on TwitterPlus on Google+