Operation Barbarossa was the Nazi German military invasion of the "USSR", since this was the famous surprise attack by Germany that broke the Nazi-Soviet Pact in World War II.
Answer from: Quest
a. factors that are used to make goods and services
What event started the space race and made americans feel their security was threatened a.) alan shepard's suborbital flight. b.) the launch of sputnik c.) the launch of explorer d.) the cuban missle crisis