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 : J apan 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.