How did nationalism, imperialism, and militarism help raise tensions in Europe?

I hope this helped. I am sorry if you get this wrong.

Explanation:

Militarism: A clique of militaristic officers (don't worry) and politicians had gained control over a lot of countries in the years because of WWII. Which is including Hitler, Stalin and even Mussolini. There aggressive tactics had forced neighboring countries to either one appease them or either two fight back.

Imperialism: European nation's sense of rivalry and even mistrust of one and another depended as they competed for colonies in Asia and even Africa militarism (which is the policy of glorifying military power and also keeping a army always prepared for war no matter what.

Nationalism: Nationalism had increased among European nations because every other nation had thought they were always the best and then disagreed with the policies all the other nations had for their nation.

1920's

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explanation:

answer is x. lo xd