The fighting may have ended in 1918, but the Treaty of Versailles negotiations in 1919 may have been just as important. Woodrow Wilson’s noble ideas like “self determination” and “fair and lasting peace” didn’t amount to much as the Allied powers sought mainly to punish Germany. A continued naval blockade, the war guilt clause, reparations, and exclusion from the League of Nations helped put Europe on the path to World War II.
Scene from “Rome” on HBO: https://m.youtube.com/watch?v=9SFsAqqN7fU
For more on how the Treaty of Versailles and other factors contributed to the rise of Hitler and Nazi Germany, check out Episode 20.