Why did the United States enter World War One? Upon declaration of war on August 1, 1914, by the Germans, a chain reaction of events began influencing most of Europe to enter the war. Most Americans favored staying out of the conflict and President Woodrow Wilson publicly and formally stated that the United States would follow a strict "Policy of Neutrality". In three short years, however, the United States would find itself pulled into the middle of what later became known as the first World War with the opposing sides being the Triple Entente, or the Allies, (Great Britain, France, and Russia later to be joined by Italy, Japan and the U.S.) against the Triple Alliance, or the Central Powers, (Germany, Austria Hungary, the Ottoman Empire, and Italy who later defected over to the Allies). Several major events including the use of German submarine warfare, American commercial trade interests, and a strong American sentiment towards the Allies, caused the United States to officially enter into the World War on April 6, 1917. .
There were many reasons for the United States to enter the war, one of them being cultural ties. Ties of language, literature, law, and custom bound us to the British. We also had sentimental ties with France dating from the Franco-American Alliance of 1778 and the 1876 gift of the Statue of Liberty. Besides being culturally similar and countries of origin for some Americans, they were also our trade partners. President Wilson began to actively campaign for Americans to support the Allies. If the Allies were to lose the war, world economic trade would be threatened. The U.S. did sell and trade supplies and munitions to France and Britain antagonizing the Germans who had been blockaded by the British since the beginning of the war, and in consequence, could not enter into any American trade. Allied propaganda (influencing U.S. opinion) intensified American beliefs that the Germans were barbaric Huns, fighting against the great world democracies, and a danger to civilization itself.