It's essentially taught in high school and college survey courses as an item on a timeline: 'The Lusitania was sunk; the U.S. gets into World War I'. -Erik Larson
There are many theories out there. Right now I default to everyone's concern about World War II veterans dying at an estimated rate of 400 a day. With their deaths we lose the invaluable first-person information of those with primary experiences of the war on all the fronts. There is no one left in the United States who served in World War I.
The United States was never interested in the War to End all Wars, happy in our isolationism policy. A few community leaders had to shame the surrounding downs to even throw a farewell for my uncle and many other young men leaving from their community. After the war, the Congress would not even join Wilson's League of Nations.
Another possibility of the "hum-dum" attitude is due to the national and allied embarrassment of leaving a sloppy resolution, which developed the blight that welcomed fascism to the continent.
Washington, D.C. is bejeweled with memorials to all 20th century war veterans in which the United States was involved, except one. Can we all give a Jeopardy-styled answer? "What is World War I?"
While we were building a United States culture, World War I annihilated European culture. European countries hold World War I sacrifices as sacred, revering the deaths of their soldiers which was double the number of their World War II deaths. Whereas the United States lost one-third of the amount of soldiers in The Great War versus World War II.
The World War I Centennial Commission is striving to correct the lack of remembrance for our Americans who served. We are encouraged to contribute to the planned D.C. memorial. We are also encouraged to share photographs and stories of our ancestors who served in World War I.
Consider both. Here is the link to the Commission's website.
In "24 Weeks to ARMISTICE 100" (and beyond) I will have other short articles about the war, and will love your comments. I will answer them.