Answer:
2 reasons
A large portion of the causes behind WWII was the extreme Nationalism felt through out the world. Many countries were left out of the Treaty of Versailles or didn’t receive a large enough piece of the Treaty pie. This led to self interest within countries to prove their power and ability to rules as top leaders.
Because when every one nation thinks that there culture is the best then they want to expand and spread their beliefs and this causes a lot of tension between everybody thus ending in a world war
Explanation:
pls mark as brainliest
