After years of
German appeasement and the Munich Conference, when
Germany under Hitler invaded the Polish Corridor, both
Britain and
France declared war. In order to avoid a two front war like that of World War I Hitler signed a ten-year nonaggression pact with the
Soviet Union. They agreed to split lands conquered in Eastern Europe. On August 31, 1939
Germany invaded
Poland with a massive and quick attack known as blitzkrieg.
Poland was defeated by September 27 and
Germany took the western portion while the
Soviet Union took the eastern part.
After a six-month break in fighting, on April 9, 1940
Germany defeated
Denmark in less than a day.
Norway was then defeated in two days. In order to gain access to
France Germany defeated
Luxembourg, the Netherlands, and Belgium. Through Belgium
Germany was able to attack
France while avoiding the Maginot defense Line. Under Mussolini
Italy also joined
Germany's attack on
France. On June 22, 1940,
France surrendered to
Germany. Under the terms of surrender
Germany occupied the northern 2/3 of the country. However not all the French gave up the fight against
Germany. Charles de Gaulle led an underground resistance against the Nazis.
After
France, Hitler then turned his sights toward
Britain. He hoped to launch a powerful sea born attack known as Operation Sea Lion. However they were able to defend their country and was successful in holding off the
German attack. The
United States aided
Britain by passing laws such as the Lend and Lease Act, which supplied
Britain with weapons but not troops. Roosevelt hoped that America could be the "arsenal of democracy."
US ships guarded British merchant ships traveling on the Atlantic.
The
Germans knew they were defeated in
England so they began to attack Eastern Europe.
Germany first defeated
Greece and
Yugoslavia.
Bulgaria, Romania, and
Hungary allied with Hitler and the axis powers.
Germany broke its treaty and invaded the
Soviet Union, surrounding Leningrad and Moscow.
Japan began to conquer lands in Asia as
Germany was in Europe. It first conquered the Chinese province of Manchuria in 1931 and then invaded China itself in 1937. When the
United States felt that
Japan was threatening
US controlled Philippines as well as other European controlled colonies it cut off vital supplies that
Japan needed for its war effort. In retaliation, on December 7, 1941, the
Japanese devastated the
US naval base at Pearl Harbor. The
United States retaliated by declaring war on
Japan and entered World War II against the Axis powers. The Allies won victories at The Battle of the Coral Sea and at Midway, turning the tide of war in the Allies favor. The
United States then began island hopping conquering
Japanese holdings.
In North Africa, the
United States under Eisenhower and the
British under Montgomery won a huge victory against
Germany. The Nazis suffered further setbacks when the
Russians took advantage of the winter to defeat the
Germans at Stalingrad. Soviet troops then began to win victory after victory against the
Germans in the
Soviet Union.
The Allies then began to invade Europe through
Italy. They conquered Sicily and
Italy changed alliances, switching from axis support to ally support. The "nail in the coffin" for the
German Third Reich came on June 6, 1944 when the Allies launched an invasion code-named D-Day on Normandy,
France. The Allied forces pushed the
Germans east as the
Soviet Union pushed
German troops west. The two sides met at Berlin where
Germany was forced to surrender. Hitler could not bear defeat and killed himself.
Meanwhile, the
Japanese were able to continue to hold off allied forces. Truman decided to end the war against
Japan quickly and decisively with the use of the
United State's secret weapon, the atomic bomb. Bombs were dropped on both Hiroshima and Nagasaki killing 120,000 nearly instantly. Shocked by amount killed Emperor Hirohito surrendered on September 2, 1945. Overall, over 40 million people were killed in the war.