When did Vietnam begin?
Vietnam became independent from France after World War II, when the Japanese War in the Pacific triggered the invasion of French Indochina in 1941.
You mean "When did the Vietnam War start?" or "when did Vietnam the country begin" The Vietnam War officially started in the early 1950s, when France refused to give independence to French Indochina (Vietnam, Laos,Cambodia). The French surrendered in 1954, and Vietnam gained independence as two separate countries in 1955. The US involvement lasted from 1957 until 1975. Modern day Vietnam was founded in 1976.