We were dragged into WWI because German U-boats and submarines sank one of the British ships " The Lusitania". That ship had Americans on it. Somewhere around 200 were killed, and that was just the Americans!
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Pretty much because of the acronym MAIN. Which is Militarism-Alliances-Imperialism-And Nationality. If you know more about those topics the question should be easily answered,
Germany fought the us in world war 1
The US helped France in world war 1 with submarines in the Atlantic.
japan
World War 1
The Franco-Prussian War was not directly related to the entry of the US into World War I.