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en.wikipedia.org/wiki/Military_history_of_the_United_States_during_World_War_II

The military history of the United States in World War II covers the war against the Axis powers, starting with the December 7, 1941 attack on Pearl Harbor.During the first two years of World War II, the United States had maintained formal neutrality as made official in the Quarantine Speech delivered by U.S. President Franklin D. Roosevelt in 1937, while supplying Britain, the Soviet Union ...

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

World War II (1939-1945) was the largest armed conflict in human history. ... Although the war began with Nazi Germany's attack on Poland in September 1939, the United States did not enter the war until after the Japanese bombed the American fleet in Pearl Harbor, Hawaii, on December 7, 1941. Between those two events ...

www.historyonthenet.com/when-did-america-enter-ww2

So when did America enter WW2? Officially after the bombing of Pearl Harbor, but the United States had been moving toward allianceship with Allied Powers for years. This article is part of our larger educational resource on World War Two.

worldwar2history.info/WWII/United-States.html

This is a brief overview of the entry of the United States into World War II. World War II History Home Page > U.S. Army > Brief History of WWII > United States Enters the War A Brief History of WWII The United States Enters the War. Jump to: A Brief History of U.S. Army in World War II -- Index | Introduction The War in Europe ...

www.reference.com/history/did-united-states-enter-world-war-ii-f4a6fa6c3aedc50a

The United States of America entered World War II due to the Japanese attack on Pearl Harbor. However, before the attack of Pearl Harbor, the United States played an indirect role in the war by trading arms with Allied countries, such as Britain.

www.answers.com/Q/When_did_the_US_enter_World_War_2

The US entered World War 2 after the attack on Pearl Harbor. When over 2,400 US lives were lost in a sneak attack on a Sunday morning, there was no stopping US involvement in the war. share:

en.wikipedia.org/wiki/American_entry_into_World_War_I

The American entry into World War I came in April 1917, after more than two and a half years of efforts by President Woodrow Wilson to keep the United States out of the war.. Apart from an Anglophile element urging early support for the British, American public opinion reflected that of the president: the sentiment for neutrality was particularly strong among Irish Americans, German Americans ...

www.answers.com/Q/Why_did_the_US_become_involved_in_World_War_2

Why did the US become involved in World War 2 in Europe? The US became involved in WW2 after Japan bombed Pearl Harbour so that they could eliminate the threat of the Japanese Empire. share:

visitpearlharbor.org/didnt-american-initially-join-war

Before the United States joined World War II in response to the Japanese attack on Pearl Harbor, the great battle had been raging in Europe since 1939. While the British and Russians struggled against the German Reich, the United States remained officially neutral and refused to enter the war. What was keeping the American government […]

www.socialstudieshelp.com/USRA_WWII_Begins.htm

Why did the United States enter World War II? America tried to stay neutral, yet in the face of impending war we slowly become more involved. Long before we entered the war FDR said this: