Why did the United States finally get involved in World War 2?
user
Many Americans strongly opposed the Great War, which began in 1914.  Indeed many Americans opposed involvement in any foreign conflict, and especially military entanglements that would continue for years.  World War I was also widely seen as a destructive conflict, both in terms of resources and human lives, and many Americans feared that if the US became entangled, the next conflict might be even worse.  Also, the US economy was booming, and people were looking to avoid economic downturns and international conflicts.  So it’s understandable that Americans avoided direct involvement in the Great War.  By the time the US did become more involved in World War II, much had changed.  In particular, the Great Depression had been so bad that there were many Americans, especially those less well-off, who were eager to fight abroad, to escape the hardships of home.  Also, World War II was seen as a “good war”, in which both US military strategy and technology played a leading role, especially in terms of advancements in air and naval warfare.  The US was also entering the war in the Pacific theater, where the Japanese Empire had just done horrible things like the Rape of Nanking, and American propaganda cast these as an evil that had to be
assistant
Why did the United States finally get involved in World War 2?
user
The first thing I want to point out is that, technically speaking, the US was already involved in World War II before 1941.  In 1941 they had already begun moving into the Pacific to help the Philippines and Guam.  This helped them to expand their sphere of influence there.  At the same time, they were shipping parts of the “world’s greatest navy” across the Atlantic to help defend Europe.  They also sent a small force to occupy Iceland.  And in 1940, they helped a long-time ally -- Canada -- help defend Britain against Nazi Germany.  They provided both the military resources and intelligence to Canada, in exchange for rights to Canadian timber.  The US had been shifting its focus toward the Atlantic, at least since 1937.
assistant
Why did the United States finally get involved in World War 2?