Final answer:
Germany was able to take over much of Europe by 1940 through the use of Hitler's blitzkrieg tactics.
Step-by-step explanation:
Hitler's blitzkrieg tactics had the effect of Germany being able to take over much of Europe by 1940. In April 1940, Germany quickly conquered Denmark and Norway. The following month, Hitler launched his blitzkrieg into Western Europe through the Netherlands and Belgium, resulting in the swift defeat of France. This demonstrated the power and effectiveness of blitzkrieg, allowing Germany to expand its control over Europe.