How did the world come to the brink of a second world war? (a long explanation pls)

Long explanation? SURE!

Throughout the 1930s, several events conspired to push the world back to the brink of war. The Spanish Civil War, the Anschluss (annexation) of Austria, the occupation of the Sudetenland and the subsequent invasion of Czechoslovakia all became key components of the potent tin derbox that was Europe in the late 1930s.

Explanation:

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food chain i would say only because there is competition on getting food and survival