As one of the Vietnam War's final battles raged four decades ago, Quynh Pham lay with her mother in a field covered in a stranger's blood. They survived only by pretending to be dead.

They were among an exodus of over a million South Vietnamese who fled oppression and uncertainty before and after U.S. forces retreated and victorious North Vietnamese tanks rolled into Saigon in April 1975, reuniting the two sides under communism.

Pham, 41, resettled in California and is now owner of an art gallery in Ho Chi Minh City, one of a stream of Vietnamese-Americans who found their fortunes in a fast-changing Vietnam where capitalism is thriving under communist rule.