Islam started spreading when the country had too much people. This was helped by trade. Which increased the chance that people of Islam

know the places around the world.

Islam also spread because of too much people in the Muslim civilization. As any people would do if too much people is in the city, go find new lands.

And war broke out on each way and the Islamic army won, because bigger army.

Source: Wikipedia

24%

Spain

42%

34%

How did Islam spread?