The collapse of Tiwanaku around 1000 seems to have been caused by

In Mesoamerican myths, Tollan is

According to the accounts of Spanish conquerors, Mayan

A Sogdian family living in China is credited with introducing the techniques of ___________ to China.

Agriculture emerged as a way of life in North America after ________ was introduced from Mesoamerica around 1000 B.C.E.

On many islands, _____________ began to strain resources after 1100.

The formal hierarchy of the four major caste groups

The Turks preferred means of obtaining booty was through

Communication between North and South America in this period was hampered by

Scholars have traced the origins of Mesoamerican cultural and political traditions to the ancient _______ civilization.