A global war is a war that encompasses and effects every nation. With the rise of extreme powers pre 1939 Europe was fast moving toward WWII. But even with the invasion of Poland, Sept. 1, 1939 the war was not yet global. The US with Woodrow Wilson, still maintained an isolationist view and Russia, still under the impression of Hitler's Nazi-Soviet non-aggression pact, still had not entered the war. Leading up to 1941 WWII was still a European war and remained so until 1941 when Germany invaded Russia and Japan attacked the United States, making it a global war.

On September 1, 1939 Hitler's blitzkrieg invaded Poland sparking the start of WWII. The blitzkrieg soon showed it's superior strength and by May 10, 1940 Germany had invaded Poland, Finland, Denmark, Norway, France, Belgium and the Netherlands with little trouble. The Germans had taken France with resistance from British and French troops. The Germans had pushed the troops...