Hitler was able to conquer much of Europe very quickly as he expanded Germany’s territory. There were reasons why he was able to accomplish this.
Germany was able to move through Europe very fast. Austria, Czechoslovakia, and Poland all fell into Germany’s hands before the war began. Part of the reason why this happened was that the Allies were so busy dealing with the effects of the Great Depression, they ignored Germany’s initial aggressive actions. When Germany began to build up their military and move it into the Rhineland, no action was taken. The same thing occurred when Germany annexed Austria. When the Allies gave part of Czechoslovakia to Germany with the Munich Pact, and when Hitler broke that agreement by taking the rest of Czechoslovakia, people knew that war was likely. That occurred when Germany invaded Poland.
Hitler had built a strong German military. Most of the countries in Western Europe weren’t prepared to deal with this lightning-fast moving military. German airplanes would dive bomb the places they were attacking. Then, the army would move in and control the country. This led to the fall of many countries in just a few months beginning in April 1940. Norway, Denmark, Belgium, the Netherlands, Luxembourg, and France were conquered by Germany. By the end of June 1940, only Great Britain remained in Hitler’s path of conquering Western Europe.
Germany was able to conquer a lot of land in a short period of time for a variety of reasons.