In Pre-Columbian America, the primary differences between the people groups of South America and Mesoamerica were their methods for exchanging specialized goods and the extent of ecology’s influence on them. In South America, the Inca conquered distant territories and increased the amount of forced exchanges in which conquered peoples had to provide resources from their distinct ecological zones. Essentially, the Inca used their state power to develop and extend vertical exchange, a system of controlled exchanges between different ecological areas. However, in Mesoamerica, state power was not the primary method for exchanging specialized goods. Instead, goods were distributed through markets as well as tribute relationships. In the Aztec