Public opinion in the USA as late as November 1941, a full two years into the European war, indicated the American public was about evenly split on whether to support Britain or stay neutral.
In WWI, the USA had been duped by British Propaganda on a wide assortment of issues including supposed German atrocities, the Zimmerman telegraph to Mexico, the Lusitania sinking, and many other issues. Americans, for the most part, were determined not to be manipulated by the British again.
President Roosevelt was an advocate of war with Germany and was trying everything he could as the leader of a representative democracy to get the USA involved. Mostly he used his powers to provoke Germany - arming and financing her enemies, killing her sailors, providing volunteers to the British military, etc. Had these provocations been reversed there is little doubt that the USA would have given a declaration of war to Germany.
In the USA many persons wished for the USA to remain neutral. These included members of the Bund, a large social organization mainly of German-Americans (the largest ethnic group in the USA was and is German-American). The most popular public figure in America was Charles Lindberg, the flier. He was an advocate for things German and a big admirer of their air force.
On the other hand were the Jewish groups. Jews essentially controlled the movie industry in America and used it to promote their anti-German ideals. Jews were also very influential in Washington, much more so than their relatively small population would indicate.
All this changed December 7, 1941. Japan attacked Pearl Harbor, Hawaii. Most Americans were not aware that Japan had been provoked by American moves to steal their financial assets in the USA, Britain and Holland, nor that Japan's economy was threatened due to an American instigated oil embargo. However, Americans became instantly aware of the 'sneak attack' on sleeping sailors.
Nonetheless, while the USA was 99% for the war with Japan, there remained no consensus for the USA to be involved in the European conflict. Into this situation stepped Hitler, who declared war on the USA and thus settled the matter.
The USA was thus unified for war immediately. The Bund and similar groups disbanded almost immediately (with a lot of help from Roosevelt and his political allies). Lindberg suddenly became a born again anti-Nazi. The country organized for total war quickly and efficiently. Even during the disasters that followed in the Pacific over the next six months did not appear to sway public opinion. Americans were determined to revenge Pearl Harbor.
Eventually, as in most wars, the situation took a nasty turn. Public opinion and that of the American leadership became more racist and bloodthirsty. Innocent Japanese civilians were incarcerated en mass. German and Japanese civilians by the hundreds of thousands were killed by indiscriminate bombing of population areas. Japanese prisoners of war became a rarity - while few were willing to surrender, even fewer were allowed to surrender to the Marine Corp. There were plans and discussions to murder the entire German army top officer corp after the fighting was over. There were also serious discussions about turning Germany into an agrarian nation, which was basically a plan to murder/starve about 50% or 60% of the civilian population. While public support for these issues was never secured, the fact that they were occurring and discussed is a clear signal that the USA was fully organized for total war and support for it was near universal.
The "public" was being drafted into military service; which influenced public opinion, which in turn influenced the protests and riots against the war.
The shift in American public pinion occured when Germany sank the Lusitania.
1940
The Japanese had a mentality of 'no surrender' during World War 2 because they had fought for so long during World War I. The idea that the Japanese might not win the war was inconceivable at the time.
The Committee on Public Information (CPI) was established during World War I to promote and sustain public support for the war effort in the United States. It aimed to disseminate propaganda through various media, including posters, films, and speeches, to shape public opinion and encourage enlistment, war bond purchases, and overall patriotism. The CPI sought to unify the American public by presenting a favorable image of the war and demonizing the enemy, ultimately playing a crucial role in mobilizing the nation for war.
By 1940 American public opinion had come to favor providing Britain with aid. This aid was considered to be all aid short of actually joining the war.
Strong to win the war
posters
It was actually supported.
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Non-intervention
Neutrality laws American isolationism U.S. public opinion
Samuel R. Spencer has written: 'Decision for war, 1917' -- subject- s -: American Foreign public opinion, World War, 1914-1918, Laconia - Steamship : 1911-1917 -, Public opinion, American Public opinion, Causes, History
Ralph B. Levering has written: 'The cold war, 1945-1987' -- subject(s): Foreign relations, World politics 'American opinion and the Russian alliance, 1939-1945' -- subject(s): American Foreign public opinion, Diplomatic history, Foreign public opinion, American, Foreign relations, Public opinion, World War, 1939-1945 'The public and American foreign policy, 1918-1978' -- subject(s): Public opinion, Foreign relations
Mihaela Glaess has written: 'Das Deutschlandbild' -- subject(s): American Foreign public opinion, History, Public opinion, World War, 1939-1945
They pooped in their pants
The Committee on Public Information was created during World War I.