de was one of the key things that helped Islam spread. How? Well, I'll tell you. Arabia was already a "Crossroads Location" and so there were many traders coming in and out of Arabia. After Muhammad preached the word of God, many Arabians converted to Islam. Since there were so many traders, many of the traders converted to Islam too. After that, it just spread like a desease. Traders were telling everyone they came in contact to about Islam, and what there beliefs were. Many of the people who heard about this questioned there own religions and converted to Islam. After that friends told friends about Islam and it just rapidly grew. If there were no traders in the first place, Islam might have not grown so quikly. Traders went all different directions and places tooo, so it wasnt like only one part of the continent was converting, but the whole contenent because of their trade routs, and the number of traders there were.