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The conflict was the deadliest in human history with estimated deaths ranging from 50 million to over 70 million soldiers and civilians.<ref>http://users.erols.com/mwhite28/warstat1.htm#Second</ref>  It ended with the Soviet Union dominant in a part of Central Europe and all of Eastern Europe, and the U.S. and its allies dominant in Western Europe, a part of Central Europe and Scandinavia, setting the stage for the [[Cold War]].

The conflict was the deadliest in human history with estimated deaths ranging from 50 million to over 70 million soldiers and civilians.<ref>http://users.erols.com/mwhite28/warstat1.htm#Second</ref>  It ended with the Soviet Union dominant in a part of Central Europe and all of Eastern Europe, and the U.S. and its allies dominant in Western Europe, a part of Central Europe and Scandinavia, setting the stage for the [[Cold War]].

==Causes==

==Causes==

:''See: [[Causes of World War II]]''

:''See: [[Causes of World War II]]''

==War Begins in Europe==

==Invasion of Poland==

[[File:58692.gif|thumb|300px|right|By terms of a secret protocol to the [[Nazi-Soviet pact]], [[Poland]] was partitioned with Germany and the USSR each occupying 200,000 square kilometers.]]

[[File:58692.gif|thumb|300px|left|By terms of a secret protocol to the [[Nazi-Soviet pact]], [[Poland]] was partitioned with Germany and the USSR each occupying 200,000 square kilometers.]]

{{See also|Molotov-Ribbentrop pact|World War II: 1939}}

{{See also|Molotov-Ribbentrop pact|World War II: 1939}}

===Battle of Britain===

===Battle of Britain===

With Britain the sole opposing European nation, the [[Battle of Britain]] commenced. The [[Luftwaffe]] attempted to achieve aerial dominance over the south of Britain, in order to allow a sea based invasion of the British Isles to proceed. From 10 July to the end of October the [[Royal Air Force]] and the Luftwaffe fought for dominance; the resilience of the RAF, which counted in its ranks also Commonwealth personnel, US volunteers and Polish and Czech exiles, and the use of [[radar]] and its associated early warning systems, had forced a rethink of German tactics. It was the first significant setback for the Germans in the War. They now concentrated on the great population centers, especially London, hoping that huge civilian casualties would weaken morale and lead to a lessening of the war effort by the populace. The period that followed, popularly known as [[the Blitz]], lasted into May 1941. Around 40,000 civilians and civil defense workers died; but the Germans failed to reach their objectives and their resources were soon diverted to the Eastern front as Hitler began concentrating on the impending invasion of the Soviet Union.  

With Britain the sole opposing European nation, the [[Battle of Britain]] commenced. The [[Luftwaffe]] attempted to achieve aerial dominance over the south of Britain, in order to allow a sea based invasion of the British Isles to proceed. From 10 July to the end of October the [[Royal Air Force]] and the Luftwaffe fought for dominance; the resilience of the RAF, which counted in its ranks also Commonwealth personnel, US volunteers and Polish and Czech exiles, and the use of [[radar]] and its associated early warning systems, had forced a rethink of German tactics. It was the first significant setback for the Germans in the War. They now concentrated on the great population centers, especially London, hoping that huge civilian casualties would weaken morale and lead to a lessening of the war effort by the populace. The period that followed, popularly known as [[the Blitz]], lasted into May 1941. Around 40,000 civilians and civil defense workers died; but the Germans failed to reach their objectives and their resources were soon diverted to the Eastern front as Hitler began concentrating on the impending invasion of the Soviet Union.