Answer:
Tensions between European nations were growing for several years before World War II finally broke out. Some historians trace the roots of the conflict back to the Treaty of Versailles, which ended World War I and imposed harsh penalties and reparations on Germany. Others point to the rise of fascist regimes in Italy and Germany, or the failure of the League of Nations to prevent aggression by Japan, Italy, and Germany in the years leading up to the war. In any case, it's clear that the tensions that led to World War II had been building for several years before the war finally broke out in 1939.
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