The United Nations, as an organisation created by equal sovereign states and built upon a single set of principles as the UN Charter, has the capacity and responsibility to deal with matters in the sphere of international peace and security.
The Cold War put an obstacle in the way of the Organisation to use its delegated powers in conflict resolution within the few years of its establishment.
For example, 'I believe in the Loch Ness Monster based on supporting historical evidence, but largely because I watched it eat my grandfather's hat.' That's a thesis statement. But most are, and therefore most require thesis statements.
When there isn't a prompt involved, the thesis is answering the writer's own question that she poses for herself, which she turns into an argument for the reader (which is to say, if you decided to write an essay about why you believe in the Loch Ness Monster, the answer to the question of whether you believe in it is already embedded in your thesis). Let's take a look at the kinds of essays that do and those that don't.
So, if the prompt says, 'Do you believe in the Loch Ness Monster?
United Nations Thesis Statement
Explain why or why not', then the thesis, in the first paragraph, should answer this directly. Seriously, though, an essay is a just a short-form piece of writing, and not every piece of writing is designed to lay out a specific argument.
As a result, and because of the necessity to deal with international conflicts, the institution of peace-keeping emerged with the aim of deploying forces not to end the aggression, breach of or threat to the peace, but for supervision of cease-fires or providing an interposition force between the belligerents, characterised by impartiality and a limited military capability.
The demise of the Cold War offered the opportunity to the Organisation, especially to the Security Council, to use its powers to implement law and order among nations.
Take the example that follows, from a narrative essay by writer A. Milne (who you might know as the creator of Winnie the Pooh): Sometimes when the printer is waiting for an article which really should have been sent to him the day before, I sit at my desk and wonder if there is any possible subject in the whole world upon which I can possibly find anything to say.
On one such occasion I left it to Fate, which decided, by means of a opened at random, that I should deliver myself of a few thoughts about goldfish. You can't tell from the opening paragraph, except that we know it's not going to be about goldfish (that comes later, the writer tells us).