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In his [[Why was George Washington's Farewell Addressin 1796 Significant?|Farewell Address]], President George Washington had advocated non-involvement in European wars and politics. For much of the nineteenth century, the expanse of the Atlantic and Pacific Oceans had made it possible for the United States to enjoy a kind of “free security” and remain largely detached from Old World conflicts. During World War I, however, President Woodrow Wilson made a case for U.S. intervention in the conflict and a U.S. interest in maintaining a peaceful world order. Nevertheless, the American experience in that war served to bolster the arguments of isolationists; they argued that marginal U.S. interests in that conflict did not justify the number of U.S. casualties.

In the wake of the World War I, a report by Senator Gerald P. Nye, a Republican from North Dakota, fed this belief by claiming that American bankers and arms manufacturers had pushed for U.S. involvement for their own profit. The 1934 publication of the book Merchants of Death by H.C. Engelbrecht and F. C. Hanighen, followed by the 1935 tract “War Is a Racket” by decorated Marine Corps General Smedley D. Butler both served to increase popular suspicions of wartime profiteering and influence public opinion in the direction of neutrality. Many Americans became determined not to be tricked by banks and industries into making such great sacrifices again.