How did the end of the Vietnam War lead to migration by Hmong and Mien speakers?

Following the end of the Vietnam War in the 1970s, a significant wave of migration occurred among Hmong and Mien speakers, particularly those residing in Southeast Asia.1

In Laos, many Hmong had aligned with opposition forces against communist movements. Following the revolution of 1975, more than 100,000 individuals fled the country to seek safety in refugee camps located in Thailand. From these camps, tens of thousands of Hmong and Mien people were subsequently resettled in various Western nations, including the United States, France, French Guiana, Australia, Canada, and New Zealand. This period of displacement resulted in the separation of many families and the establishment of a global diaspora for these ethnic groups.21