The British insensitivity to indian customs
There were a few reasons but the main reason was the act of Germany carrying out unrestricted submarine warfare.
This meant that German submarines would sneak attack other submarines or ships, including US property, without warning.
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Many Japanese chose to serve the U.S. in World War II because they felt it was a way to repay them. Japanese Americans were at one time imigrints coming into the United States with little supplies and a dream or two.