Yet it was a cataclysmic event in its own right that both foreshadowed more intense and violent warfare in the 20th century, and fueled the growth of gargantuan central government in the United States. Most crucially, however, it was a war that should never have been fought — its causal origins and assignment of guilt for same are still a hot topic of debate a century later, a fact that alone attests to its superfluity — and one that, in any case, the United States should never have entered. These are disturbing theses about the war that will not be remembered by any of the global elites in Paris this weekend, but given the lessons for today, Americans should learn about them so as to demand of their Beltway solons wiser policy choices in the future. What follows is a short summary of America’s involvement in the war and lessons for today.