The two significant events that ended in 1922 and 1923 and are missing from the timeline are:
- Washington Disarmament Conference is held. (1921-1922)
- Teapot Dome scandal occurs. (Began in the early 1920s and became a major political issue leading to investigations in 1922-1923)
The other options (Wilson dies in office, World War I ends, Progressives take the White House) either occurred before 1922 or do not relate directly to the timeline's focus.