Why did the US join WWI?

Why did the US join

It’s been around a century since the US declared war on Germany in 1917, but why did we join WWI? It might seem like a straightforward thing to answer, but trying to do so leads us straight down a rabbit hole to the foundation of the modern conspiracy theory movement.
Report of the Special Committee on Investigation of the Munitions Industry (US Congress, Senate, 1936), 3-13. https://www.mtholyoke.edu/acad/intrel…

Kathryn Olmsted, Real Enemies: Conspiracy Theories and American Democracy, World War I to 9/11 (Oxford, UK: Oxford University Press, 2009), 13-45. https://amzn.to/2unDgjI

Smedley Butler, War is a Racket (New York: Round Table Press, 1935). https://amzn.to/2upIriM

Alan Axelrod, Little-Known Wars of Great and Lasting Impact: The Turning Points in Our History We Should Know More About (Beverly, Mass.: Fair Winds Press, 2009), 204-219. https://amzn.to/2JqC9nG

Alan Axelrod, America’s Wars (New York: Wiley and Sons, 2002), 368-383. https://amzn.to/2NHcLOa

Max Boot, The Savage Wars of Peace: Small Wars and the Rise of American Power (New York: Perseus Books Group, 2002), 129-181. https://amzn.to/2NTVKjQ

Credit: The Cynical Historian