Final answer:
The Aztec Empire had a centralized economy, while the Incan Empire relied on a decentralized system. The breakdown of Feudalism in medieval Europe was primarily caused by economic changes and the Black Death.
Step-by-step explanation:
b. One difference in the economic systems of the Aztec and Incan Empires in the period 1200 CE - 1450 CE was that the Aztec Empire had a centralized economy, where resources and trade were controlled by the government. On the other hand, the Incan Empire relied on a decentralized system, with local communities managing their own resources and trade.
c. A cause of the breakdown of Feudalism in medieval Europe in the time period 1200 CE - 1450 CE was primarily economic changes and the Black Death. The Great Famine, Black Death, and Hundred Years' War contributed to a decline in agricultural productivity, loss of wealth among the nobility, and peasant rebellions, which weakened the feudal system.