Answer:
A total of more than 1.6 million Vietnamese were resettled between 1975 and 1997. Of that number more than 700,000 were boat people; the remaining 900,000 were resettled under the Orderly Departure Program or in China or Malaysia. (For complete statistics see Indochina refugee crisis).
Step-by-step explanation:
The Khmer Rouge and other groups fought a guerrilla war against the Vietnamese occupiers and the Cambodian government. In 1979 and 1980, the chaos caused hundreds of thousands of Cambodians to rush to the border with Thailand to escape the violence and to avoid the famine which threatened Cambodia.