What have we learnt in the past century?

The world is changing; almost two thirds of its population already live in Asia and there is a shift in the ethnic balance. The UN's is more important than ever; it has disappointed in not getting involved in a positive and robust way in certain disputes where a form of genocide has taken place, but they are constrained by their remit. Perhaps it requires a change of location from NY to reflect the changing population distribution and a time to review their raison d’etre.