World War I and World War II happened because of a multi-polar geopolitical power balance. I’d prefer not to live through World War III, now that nuclear weapon

World War I and World War II happened because of a multi-polar geopolitical power balance. I’d prefer not to live through World War III, now that nuclear weapons exist. There is no organization that can prevent one state from going to war with another, I believe a multi-polar world would inevitably lead to a global scale conflict.