Respuesta :
The answer is, Nations must cooperate to bring about and maintain world peace, and No country must develop or own any sort of nuclear weapons.
The two ideas related to international relations that was promoted in WWII were:
- Nations must cooperate to bring about and maintain world peace.
- No country must develop or own any sort of nuclear weapons.
What did the allies do in WWII?
They showed that nations need to cooperate together to preserve world peace when they came together as allies to defeat the Nazis.
They also showed that nations should not develop nuclear weapons when the atomic bombs used on Japan killed tens of thousands.
Find out more on the allies in https://brainly.com/question/1643659.