American entry into World War I

The United States entered into World War I on 6 April, 1917, more than two and a half years after the war began in Austria-Hungary. Apart from an Anglophile element urging early support for the British and an anti-tsarist element sympathizing with Germany's war against Russia, American public opinion had generally reflected a desire to stay out of the war.

Source: Wikipedia — American entry into World War I (CC BY-SA 4.0)