3.1. Expansion and Intensification of
Communication and Exchange Networks
Although Afro-Eurasia and the Americas remained separate from one another, this era witnessed a deepening and widening of old and new networks of human interaction within and across regions. The results were unprecedented concentrations of wealth and the intensification of cross-cultural exchanges. Innovations in transportation, state policies, and mercantile practices contributed to the expansion and development of commercial networks, which in turn served as conduits for cultural, technological, and biological diffusion within and between various societies. Pastoral or nomadic groups played a key role in creating and sustaining these networks. Expanding networks fostered greater interregional borrowing, while at the same time sustaining regional diversity. The prophet Muhammad promoted Islam, a new major monotheistic religion at the start of this period. It spread quickly through practices of trade, warfare, and diffusion characteristic of this period.
3.2. Continuity and Innovation of State Forms and Their Interactions
3.3. Increased Economic Productive