The United Nations and Peace

Does the United Nations create peace? or, did peace create the United Nations?

The United Nations, as well as League of Nations, were created after major wars, WW I and WW II. During the wars, they were not built.

That means that they were created during no war, peace. But, the purpose of them is to build peace.

Which is which?

The United Nations is making efforts to build and maintain world peace. It is enough for me. I like it.

However, this shows the weakness of the United Nations.

Both world wars have started with an aggression of one state, and the war was expanded over the world because of alliances that the aggressor had. The alliances involved many states in the wars. Then, a war between two states gradually became a world war.

....Alliance

Yes, the Untied Nations is a kind of alliance. Alliance seeks collective defense. If one state attacks another, the other states who have an alliance with the attacked state join the war against the attacking state.

I think the United Nations is large organization enough to prevent world war, but systemically it is possible for the next world war occur due to the United Nations as one alliance.

There is no guarantee that the world war will never happen again.