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en.wikipedia.org/wiki/Military_history_of_the_United_States_during_World_War_II

World War II cost the United States an estimated $341 billion in 1945 dollars – equivalent to 74% of America's GDP and expenditures during the war. In 2015 dollars, the war cost over $4.5 trillion. In 2015 dollars, the war cost over $4.5 trillion.

www.answers.com/Q/How_long_was_the_US_involved_in_World_War_2

The U.S. was in WWII from December 8, 1941 (when FDR signed the declaration of war against Japan, and 4 days later Germany declared war on the U.S.) until September 2, 1945 (when Japan signed the ...

www.history.com/topics/world-war-ii/world-war-ii-history

After the December 7, 1941, Japanese attack on the American naval fleet at Pearl Harbor, Hawaii, the U.S. was thrust into World War II (1939-45), and everyday life across the country was ...

www.answers.com/Q/How_long_did_World_War_2_last

World War II began on September 1, 1939 when German forces invaded Poland. The war in Europe ended when General Alfred Jodl signed the unconditional surrender for all German units on May 9, 1945.

www2.gwu.edu/~erpapers/teachinger/glossary/world-war-2.cfm

The roots of World War II, which eventually pitted Germany, Japan, and Italy (the Axis) against the United States, Great Britain and the Soviet Union (the Allies), lay in the militaristic ideologies and expansionist policies of Nazi Germany, Italy, and Japan.

en.wikipedia.org/wiki/World_War_II

World War II (often abbreviated to WWII or WW2), also known as the Second World War, was a global war that lasted from 1939 to 1945. The vast majority of the world's countries —including all the great powers —eventually formed two opposing military alliances : the Allies and the Axis .

www.nationalww2museum.org/.../research-starters/america-goes-war-take-closer-look

Before World War II Andrew Higgins operated a small boatyard, building workboats designed to operate in the shallow waters of Louisiana's bayous. During the 1920s and 1930s America's military began exploring ways to make amphibious landings.

history.army.mil/brochures/brief/overview.htm

Introduction World War II was the largest and most violent armed conflict in the history of mankind. However, the half century that now separates us from that conflict has exacted its toll on our collective knowledge.

www.quora.com/How-did-World-War-II-affect-America

It affected America in a very drastic way. America suffered an economic crisis due to the Great Depression that resulted to millions of unemployed and Impoverished American Citizens. This event not just affected America in a large scale but also t...

timeline.com/its-amazing-just-how-many-americans-served-in-world-war-ii-18d197...

Today is VE Day, the 71st anniversary of World War II ending in Europe. Out of the more than 16 million Americans who served, 2 million served in Europe, though the war against the Nazis has an outsized place in the American imagination. That number of enlistees is remarkable.