How did nationalism lead to ww2?

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:

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c 3 branches because idk why they had 3 well when:

you think of it there are still contrys with 3

there has only been 12 presidents. the 12th president is/was moon jae-in