Most of us know that The sinking of the Lusitania was one of the factors to the United States entering the Great War, The sinking was due to the German U-boat campaign, where Germany declared that all Allied and neutral ship were to be sunk on sight. They wanted to cut off Britain supplies from America. By March 1917, Germany U-boat seven American vessels.Woodrow Wilson realized that staying neutral and out of the war could not be avoided, and Declared war on Germany. I honestly believe that staying out of the war so long is what helped the United stated win. They entered a war that opposing side and the allies were both decreasing in the number of soldier. The United states lost over 100,000 soldiers, which sad as it may be was only 1 % of the soldiers that were lost in this Great War!