They underestimated; The strength of the British and their Native American allies, and the loyalty of the Canadians, particularly those who had been Americans.
US leaders also underestimated the degree to which corruption and failure to maintain the army had hurt its fighting ability.
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World War 2 taught (some) Americans that we need to be more tolerant of different races. When they heard the horror of the Holocaust, they realised that we were also intolerant of African-Americans as they were of the Jewish population.
Eagerness for national superiority.
See website: Statistics About the Vietnam War.
World War II. Over 16 million Americans served.
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