@GreenSkyOverMe because before the Vietnam war started, and after it ended, the US have been continuously bombing Laos, making it the most bombed country in history. The Hmong people were among those, most affected. https://www.npr.org/2023/07/11/1186949348/us-cluster-munitions-civilian-casualties-laos#:~:text=Between%201964%20and%201973%2C%20the,minutes%20for%20nearly%20a%20decade.