| The roots of sweet music grew from the post World War I urban craze for large dance halls and for dancing in hotel ballrooms and private clubs. |
| The effort to achieve more accurate weapons began in World War I and approached modern capabilities with PGMs toward the end of the Vietnam War. |
| By World War I their tactics and strategies linked the national to the local in a broad agenda for change. |
| After World War I they were less sanguine about progress and more inclined to the hereditarian pessimism of eugenics. |
| Bliss worked on ballistics during World War I and designed new firing tables for artillery. |
| The army that fought World War I was composed of regulars, National Guardsmen, and individual volunteers. |
