Final answer:
Hitler broke the Non-aggression Pact and invaded the Soviet Union in 1941.
Step-by-step explanation:
The year in which Hitler broke the Non-aggression Pact with the Soviet Union and invaded it was 1941. The Non-aggression Pact, also known as the Molotov-Ribbentrop Pact, was signed in 1939 between Nazi Germany and the Soviet Union. However, in 1941, Hitler ordered the invasion of the Soviet Union, launching Operation Barbarossa. This marked a significant turning point in World War II.
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