Q. Which treaty was nullified following the German invasion of the Soviet Union in 1941?
Answer: Molotov-Ribbentrop Pact
Notes: The Molotov-Ribbentrop Pact, signed in 1939, was a non-aggression treaty between Nazi Germany and the Soviet Union. It ensured that both nations would not attack each other and allowed for the division of Eastern Europe. However, this agreement was rendered void when Germany invaded the Soviet Union in June 1941, leading to significant geopolitical shifts and the eventual involvement of the United States in World War II.