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The event that was most influential in turning American public opinion against Germany was the invasion of Belgium.
the Halocaust and Hitler's determination to kill all Jews and establish a super race
Ostensibly , the 'rationale' behind the illegal incarceration of American citizens of Japanese descent was to insure internal security against sabotage .
Most likely the attacks by Germany (in either world war) against American civilians and American shipping in the Atlantic Ocean.
In the Great War, American public opinion turned against Germany following persistent attacks by submarines on merchant shipping. The most notorious sinking was that of the passenger steamer RMS Lusitania on 7 May 1915 when 1198 out of 1959 passengers and crew were killed. The RMS Lusitania was a British ocean liner, and was was torpedoed and sunk by a German U-boat.
GERMANY
No, the sinking of the USS Maine caused the Spainish-American War.
The sinking of the ocean liner RMS Lusitania .
Influential ideas he was against: mercantilism, physiocracy, and imperialism. Influential people: David Hume, Aristotle
1. WWI-Unrestricted sub warfare turned people against Germany. 2. WWII-America liked Germany prior to WWII, Germans even visited the US in the 1930s. Germany declared on America. America did NOT declare war on Germany (America simply reciprocated). Hitler wanted Japan to open a second Russian Front, as he had just invaded Russia the same year that Japan bombed Pearl Harbor; he also declared war the same year he invaded Russia. If Hitler helped Japan, he hoped Japan would help him.
Belgium was a neutral nation
If you are referring to pre-WWII sentiment, the turning point was the realization that Hitler was using Charlie Chaplin's mustache for evil rather than for good, and perverting the public opinion of mustaches in general. In a patriarchal society such as ours, facial hair is just that important.