Final answer:
The attitude and treatment of conquered people by Muslims helped spread Islam through factors such as allowing religious freedom with a tax, promoting trade and economic exchange, and establishing Islamic institutions.
Step-by-step explanation:
The Muslims' attitude toward and treatment of conquered people helped them spread Islam in several ways. First, they allowed conquered people to practice their own religion as long as they paid a tax called the jizya. This policy allowed conquered people to maintain their own faith but also created an incentive for them to convert to Islam to avoid the tax. Second, the Muslims promoted trade and economic exchange within their empire, which facilitated the spread of ideas, including Islam. Finally, the Muslims established Islamic religious institutions in conquered territories, providing a consistent and familiar religious framework that helped unify and spread the faith.