The correct answer to this open question is the following.
The 33rd US President Harry Truman said: "The United Nations is designed to make possible lasting freedom and independence for all its members." Do you think these will come one day?
I really wish that quote could come true one day. However, the power, ambition, and hunger for economic control of government leaders make that quote sound more like an illusion than a possible reality.
The United Nations mission is clear. To bring peace to all regions of the world. The problem is that in reality, all world superpowers have political and economic interests worldwide, and have always tried to impose their policies trying to protect these interests.
Examples? Many. For instance the Cold War. The conflicts in the Middle East, just to mention a few.