September 5, 1939 - United States proclaims its neutrality; German troops cross the Vistula River in Poland.

September 27, 1939 - Warsaw surrenders to Nazis ; Reinhard Heydrich becomes the leader of new Reich Main Security Office (RSHA).

May 10, 1940 - Nazis invade France, Belgium, Luxembourg and the Netherlands; Winston Churchill becomes British Prime Minister.

September 5, 1939 - United States proclaims its neutrality; German troops cross the Vistula River in Poland.

September 27, 1939 - Warsaw surrenders to Nazis ; Reinhard Heydrich becomes the leader of new Reich Main Security Office (RSHA).

May 10, 1940 - Nazis invade France, Belgium, Luxembourg and the Netherlands; Winston Churchill becomes British Prime Minister.

One married couple was responsible for the foundations of modern code breaking , and the principles that gave the NSA a head start in cryptanalysis. Though the husband, William Friedman, is usually apportioned the lion’s share of the credit, his wife Elizebeth Friedman was in every way his equal. During World War II, both worked under total secrecy, and only now are we learning about Elizebeth’s critical work uncovering the secrets of Nazi spies—and cracking the codes of the notorious “Doll Lady” suspected of working for the Japanese.

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The most destructive war in all of history, its exact cost in human lives is unknown, but casualties in World War II may have totaled over 60 million service personnel and civilians killed. Nations suffering the highest losses, military and civilian, in descending order, are:
USSR: 42,000,000
Germany: 9,000,000
China: 4,000,000
Japan: 3,000,000

No one historic event can be said to have been the origin of World War II. Japan’s unexpected victory over czarist Russia in the Russo-Japanese War (1904-05) left open the door for Japanese expansion in Asia and the Pacific. The United States U.S. Navy first developed plans in preparation for a naval war with Japan in 1890. War Plan Orange, as it was called, would be updated continually as technology advanced and greatly aided the U.S. during World War II.

Competing ideologies further fanned the flames of international tension. The Bolshevik Revolution in czarist Russia during the First World War, followed by the Russian Civil War, had established the Union of Soviet Socialist Republics (USSR), a sprawling communist state. Western republics and capitalists feared the spread of Bolshevism. In some nations, such as Italy, Germany and Romania, ultra-conservative groups rose to power, in part in reaction to communism.

September 5, 1939 - United States proclaims its neutrality; German troops cross the Vistula River in Poland.

September 27, 1939 - Warsaw surrenders to Nazis ; Reinhard Heydrich becomes the leader of new Reich Main Security Office (RSHA).

May 10, 1940 - Nazis invade France, Belgium, Luxembourg and the Netherlands; Winston Churchill becomes British Prime Minister.

One married couple was responsible for the foundations of modern code breaking , and the principles that gave the NSA a head start in cryptanalysis. Though the husband, William Friedman, is usually apportioned the lion’s share of the credit, his wife Elizebeth Friedman was in every way his equal. During World War II, both worked under total secrecy, and only now are we learning about Elizebeth’s critical work uncovering the secrets of Nazi spies—and cracking the codes of the notorious “Doll Lady” suspected of working for the Japanese.

Use of this site constitutes acceptance of our user agreement (effective 3/21/12) and privacy policy (effective 3/21/12). Affiliate link policy . Your California privacy rights . The material on this site may not be reproduced, distributed, transmitted, cached or otherwise used, except with the prior written permission of Condé Nast .

World War II | Facts, Summary, Combatants, & Causes.


World War II - Battles, Facts, Videos & Pictures - History.com

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