Buying land extends a country and provides more resources
Another effect of the spread of Islam was an increase in trade. Unlike early Christianity, Muslims were not reluctant to engage in trade and profit; Muhammad himself was a merchant. As new areas were drawn into the orbit of Islamic civilization, the new religion provided merchants with a safe context for trade.
It was primarily the business and shop owners in the west that <span>profited the most from the California Gold Rush, since finding gold was relatively rare, but the surge of people hoping to find gold boosted the economy of the west as a whole. </span>
The battle of Poitiers---better known as the battle of Tours 732 CE. The franks obviously prepared to resist the muslims so their victory indicates they viewed muslim expansion into europe as a threat.
