What impact did the 3 dictators had on WWII?

The three dictators—Adolf Hitler, Benito Mussolini, and Joseph Stalin—each played pivotal roles in World War II. Hitler's aggressive expansionist policies and invasion of Poland in 1939 initiated the war, leading to widespread devastation across Europe. Mussolini's Italy allied with Germany, contributing to the Axis powers' military campaigns. Meanwhile, Stalin's Soviet Union, initially bound by a non-aggression pact with Hitler, later became a crucial Allied force after Germany's invasion of the USSR in 1941, significantly altering the war's dynamics.