Which of the following was a reason world war ii began?

germany was not happy with the dominance of the united states as a world power.
the effects of the depression in europe
russia's disregard for the treaty of versailles
japanese bombing of u. s. ships

There are several reasons World War 2 (1939 -1945) begin. Some of them are :
- the Treaty of Versailles : The treaty required that Germany pay a huge sum of money called reparations. The problem with the treaty is that it left the German economy in ruins.

- Japanese expansion :Japan began to look to grow their empire in order to gain new resources. They invaded Manchuria in 1931 and China in 1937. 

- the Fascism (Franco in Spain, Mussolini in Italy and Hitler in Germany).These dictators wanted to expand their empires and began to look for new lands to conquer.

- Unstable governments as a result of the economic suffering after the World War 1(The great depression)

All of the answers mentioned in the question are reasons for the begin of World War 2.

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