Trade helped with the spread of the Islamic culture. Islamic culture before the spread was located in Arabia, which is a crossroads location. Muslims leaving the city to trade would share ideas to others, who could pass on the message. Also, people coming to Arabia could hear about the religion and tell others in their kingdom about it. A kingdom, once converted to Islam, will also help spread it by trade, in the same way that Muslims and other people spread it: by coming and going to trade.
War was very important to the spread of Islam. In fact, many people say that Islam was “spread by the sword.” By 632, the Muslims had defeated and converted many of the surrounding kingdoms. Armies then took over North Africa, the