How did the failure of the League of Nations to prevent World War II affect the formation of the United Nations? The US, the UK, the USSR, and China did not think the United Nations would be successful, so they refused to join. The US, the UK, the USSR, and China were very determined to create an effective organization that would not fail. The US, the UK, the USSR, and China were afraid to give the United Nations too much power and hindered the organization. The US, the UK, the USSR, and China had not belonged to the League of Nations, and therefore had no interest in the United Nations.