World War I or otherwise known as The Great War began in 1914 and ended in 1918. It was a battle between the Allie forces and the Central Powers. The United States tried to remain neutral during this war but eventually it collapsed and gave in to Germanys push. They entered and joined the allied forces in defeating the central powers on April 6, 1917.
There were many reasons as to why the United States remained neutral during the first three years of the war. For example, the President Woodrow Wilson was an idealist. He wanted to keep a non-interventionist military as well as a political policy with a policy of economic nationalism. Political rulers avoided entangling alliances with other nations and avoid all wars not related to direct territorial self-defense. The United States was considered to be an Isolationism nation because many people opposed the fact that they were not entering into the war.
The long stretch of American isolationism left the United States reluctant to involve itself with what was popularly conceived as a European dispute.
The neutrality of the United States had been seriously imperiled after the sinking of the Lusitania. This was when Germany was provoking America by sinking our U-boats. This wasn't all they did, though, to provoke us. They resumed the policy of unrestricted submarine warfare in the effort to break British control of the seas. In protest the United States broke off relations with Germany. This, combined with public indignation over the Zimmermann telegram, led to a final break of relations with the Central Powers. This is why President Woodrow Wilson requested that the US Congress declared war on Germany and so America had finally entered World War I.
If the United States hadn't sent their troops to Europe, there would have...