B.
Gulf of Tonkin incident
The Gulf of Tonkin incident, that is also called " the USS Maddox incident", consisted of an international confrontation that eventually led the US to engage North Vietnam directly during the Vietnam War.
It supposedly involved either one or two different confrontations with North Vietnam and the United States within the region of the Gulf of Tonkin, hence the name of the incident. Originally, the American report blamed North Vietnam for the two incidents, but it didn't take too long before it became a very controversial topic since it was a widespread belief that at least one, and most likely both incidents were false.
