Answer:
Ummah bring a great change.
Explanation:
Before Islam, the people of Arabian peninsula living in tribes and communities and the individuals gives importance to their own tribe but when the Islam spreads in these tribes, they all belong to one ummah and formed one nation. The religion of Islam united all the Arabs as one nation and able to make them a mighty power of his age who defeated the two powerful empires i. e. Roman empire and Persian empire.
