Why did the invasion of Poland launch world war 2?

A. it led Britain and France to abandon the policy of appeasement

B. it was the first time German forcesused the blitzkreig strategy

C. it led the United States to abandon the policy of neutrality

D. It violated Hitlers non aggression pact with Stalin

A. It led Britain and France to abandon the policy of appeasement

Germans invade Poland ... Nazi leader Adolf Hitler claimed the massive invasion was a defensive action, but Britain and France were not convinced. On September 3, they declared war on Germany, initiating World War II. To Hitler, the conquest of Poland would bring Lebensraum, or "living space," for the German people.