The United Nations is still that international organization with the largest number and com-petences. Which is constantly changing and is adapting to current international problems, therefore I chose it as the subject of my paper. I consider the cooperation between states is particularly important, this way they can act together and effectively step up against the problems of the world. Today, the importance of this is recognized by more and more states, and as a result, organizations and institutions that play a decisive role in cooperation are established. In my opinion, examining the creation of the United Nations is the best method to illustrate how important cooperation is and how the lack of cooperation can slow progress down.