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One of the arguments of the U.S not entering the war is that we could've set up an embargo with Germany when they made their war zones allowing no ship from American ports to go there. We would stop trade completely with Germany and form an embargo which with little time after that they would diminish their war zones.
The president at the time was Woodrow Wilson. He wanted to maintain a isolationist/neutral policy. It is also the reason that he got reelected during the war. Additionally, during this time, many Americans were "hyphenated", or foreign born, thus, resulting in their being opposed of involvement. They still had cultural bonds to other nations and foreign countries and didn't want to risk the capable conflicts.
During the first world war, some Americans might have chosen to remain neutral because they believed that it was Europe's fight, and should therefore leave them to fight it. Americans may also not have the strong ties to England (as England's allies did), because of the American Revolution that happened only decades earlier?
President Wilson overreacted to the deaths of the 300 or so Americans on the ocean liner Lusitania. Mr. Vanderbilt was on that ship. The entire problem of the monarchs, Serbians, Bosnians, Croations and Germany/Austria/Hungary was not really the business of the United States. Millions of Americans died needlessly in World War 1 because 300 plus Americans died on a ship sunk by the Germans. President Wilson should have stayed out of the negotiations of the Versailles Treaty. He created more problems than he solved. He was pushing the League of Nations onto the conference people and it was the wrong time to do it.
There's a lot of reasons. One big reason is the sinking of the Lusitania.
World War 2
The US joined the war on the side of the Allies on April 6, 1917.
archduke ferdinand
The US entered when it declared war on Germany on April 6th 1917. So they entered late.