Answer:
Read this it is important even if its not useful
Muslim Traders were so successful in their business due to following the great morals & teachings of Islam. Also , they became the true preachers of Islam because they were the principal reason behind the spread of Islam in so many regions like the South west of Asia & the West of Africa as many historians have considered them to be.
This evidence assures that Islam did NOT spread by sword as it's claimed by the opponents of Islam.
Thomas Arnold in his famous book "The preaching of Islam" states that the two primary reasons for the spread of Islam all over the world were merchants and the Sufis, two groups of people who went out, worked with humanity and gently invited others to their faith.
Hope this helps!!!
