The idea of the United Nations comes out of the League of Nations which the United States proposed but did not join. The world was happy when the United States did join the UN because they knew the US would pay nearly all the bills for the UN. The idea of the UN is to help provide peace, get those in need whatever they needed and to keep everybody calm. They do a wonderful job of keeping themselves calm, not so much the rest of the world though. They do serve a great job of trying to lend aid just not such a good job of letting those nations keep the aid they provide. Well at least they try, or sort of anyway.
How to celebrate – Visit the UN, in the United States. Check the budget, most of which the US pays. Take a guess who gets the least from the UN?