Depending on the mission criteria you set for the UN, I'd say yes they have.
Bear in mind that the UN is technically unarmed, poorly funded, and has no truly enforceable mandate. As such, you can't expect total world peace as a result of UN operations.
However, within the scope of what the UN actually can do, I think they get a passing grade.
Before leaping to an alternate answer, think for a moment and ask yourself (or others!) what the UN could have done that they failed to do.
united nations
by keeping peace farting
No
the United Nations
The United Nations
Because the United Nations is a peace-keeping order, as it was founded after the league of nations failed in its sole purpose.
When there is Territorial dispute between two nations, the United Nations send the armed force to maintain ceasefire. This force deployed by UN is called peace keeping force.
Francis Parakatil has written: 'India and United Nations peace-keeping operations' -- subject(s): Armed Forces, United Nations
The United Nations, or UN for short.
the two main goals of the u.n. are peace and human dignity.
It's hard to believe, I know, but the League of Nations was even less effective in keeping the world in peace than is the United Nations. By any measure, both organizations are/were utter failures in that regard.
The body that has the responsibility for keeping world peace is the United Nations. Most of the nations of the world gather together to talk about global issues that effect everyone and do their best to maintain peace in the world.