What are the cause of the street children?

There are many causes of there being street children: Poverty, Neglect, Disease, War, Famine, Social or Civil Unrest, Family Breakups, Becoming Orphaned. etc.

From another of perspective on the Word "causes", the causes they or others on their behalf fight for are to tackle the reasons that they become street children in the first instance and to provide ways out of their problems through things like providing shelter and education, re-uniting them with their families, finding foster or adoptive families for them etc.