The Islamic religion was expanded so frequently after the death of Muhammad through tremendous successes both by converting non-believer to Islam and by Military conquest of the Islamic community's opponent.
Another way of spreading Islam through trade networks Islamic lands linked Asia, Africa and Europe where merchants traveled through the silk road.
Abu Bakr was the first caliph or successor of Muhammad. Abu Bakr was successful in uniting the Muslim Through Military conquest they captured the parts of the Byzantine Empire, Persia, and the Middle East, etc.
