The United States entered The War to End All Wars in 1917, which was very late into the war. But regardless, the Americans joined in the war with the Allies for their own reasons. There are perhaps three reasons on why the United States entered the war. One of the main reason is why the United States entered the war was Germany as newest weapon, which was the U-boat or the Submarine. This new kind of naval weapon can sink any ship without any apparent warning. The Germans used this weapon on the Allies without mercy and soon affected the USA. President Wilson tried many ways to ask Germany to stop sinking ships with American goods and passengers but that often resulted in failure. Then February 1, 1917, Germany announced it will sink all ships from Great Britain and ships shipping to Great Britain. President Wilson then broke off diplomatic relations on February 3 and soon on April 4, USA declared war on Germany because Germany as policy of unrestricted naval warfare interfered with USA as policy of being neutral. So the main reason why the US declared war on Germany is because Germany infringed on the rights of neutral USA. The second reason why the United States entered the war is based on what President Wilson stated. As stated from his Fourteen Points, he said that the United States was going to war for creation of a general association of nations under specific covenants to give mutual guarantees of political independence and territorial integrity. This meant that the United States entered the war to preserve democracy and create nations based on the nationalities of the region. For instance, the Arabs under the Turkish rule would rule for themselves. The last reason why on the United States entered World War 1 is the economic repercussions it would cause. Since the United States was forced to send their goods to the Allies, the United State manufacturers did a huge amount of exporting to them.