Final answer:
The reasons for the start of World War II were the effects of the Great Depression, Germany's discontent with the U.S. dominance, Russia's disregard for the Treaty of Versailles, and the Japanese bombing of U.S. ships.
Step-by-step explanation:
The reasons for the start of World War II can be attributed to a combination of factors. One reason was the effects of the Great Depression in Europe, which led to political and economic instability. Another reason was Germany's discontent with the dominance of the United States as a world power. Additionally, Russia's disregard for the Treaty of Versailles and the Japanese bombing of U.S. ships, particularly the attack on Pearl Harbor, played significant roles in starting the war.