There are many reasons why the world is not in unity. Unity is built upon the love of neighbour. Wherever there is disunity, humanity suffers.
When one reflects upon life, one will soon realize that life is built upon relationships. A true strong relationship is built upon the reciprocal love between neighbours. This, in reality, to love a neighbour is not easy.
The only way through my experience of life, to love your neighbour is to love Jesus. There is no other way or method, how to love a neighbour. The source of life, that is the source of Love, is from the Loving Father.
Unity for all humanity, is only possible by Loving the Father.