The city of Teotihuacán in what is now central Mexico begins to grow unstable, as they exhaust their resources until their inevitable collapse (possibly caused by the Toltec) circa 700 AD.
The earliest references to chess are found in the Persian work Karnamak-i-Artakhshatr-i-Papakan, and the Indian works of Subandhu's Vasavadatta and Banabhatta's Harsha Charitha.