Public opinion in the United States of the World War I when it started in 1914 A. It was split because the US was home to immigrants from countries on both sides of the war.
When World War I erupted, President Woodrow Wilson proclaimed America's neutrality, and this policy was greatly supported by majority of the Americans.
However, the sinking of the Lusitania changed public opinion and the president's neutrality policy.
Thus, we can conclude the public opinion was initially split, but the German boat attack changed the equilibrium.
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