Final answer:
The spread of Islamic territory and the Islamic faith went hand in hand due to the establishment of Islamic religious institutions, trade that unified the Islamic world, and the shared language and customs among Muslim traders.
Step-by-step explanation:
The spread of Islamic territory and the Islamic faith went hand in hand for several reasons. One reason is that as Muslims migrated to new lands, they established Islamic religious institutions, which provided consistency and unity for local people as well as for travelers, traders, and visitors. Additionally, trade played a significant role in the spread of Islam, as it unified the wider Islamic world and facilitated the exchange of goods, ideas, and technologies. Finally, the shared language, Arabic, and the common set of customs, laws, traditions, and values within the Islamic faith helped foster trust and cohesion among Muslim merchants, traders, and caravanners, facilitating trans-Saharan trade.