At the beginning, there is no one on the Earth but when the human born in this world they didn't know who is their mother or father and brother or sister. They all live in unity. They all help each other when they needed. But when they started developing themselves they all differentiate each other with their appearance and their knowledge. our prayers teaches us that we are all one we are humans, but they also fought with other for their religion. At world Wars, The soldiers didn't won the war, they only killed their brother and sisters. This is why we are saying ONE WORLD ONE FAMILY. Means we all are the members of the same family, The Human Family.
Mark As Brainliest !!