USA entry into the warUSA had sworn by her Monroe doctrine of 1823 not to interfere with European issues.-However, continuous provocations led her to result into joining the war. Reasons why USA entered the war on the side of the Allies a) America was concerned with safeguarding her trade with Britain. USA was fully aware that the defeat of Allied powers would cost her financial and industrial institutions.b) Cruelty of the Germans led to the growth of anti-Germany feelings in the United States. c) The Zimmerman letter which urged the Mexican to attack the allies like the USA
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