Tet offensive was the battle that showed that the war in Vietnam was not being won as easily as it was being portrayed. It was one of the largest millitary campaigns of the Vietnam War, it started in 1968, by forces of the Viet Cong and North Vietnamese People´s army of Vietnam against the forces of the South Vietnamese Army of the Republic of Vietnam and the United States Armed Forces, and their allies.
This offensive was the largest military operation conducted by either side up to that point in the war.
The offensive had a huge impact on the U.S government and shocked the US public. Soon, the American public support declined and the US started a series of negotiations to end war.
The right answer is the Tet offensive showed the American public that the war in Vietnam was not being won as easily as it was being portrayed.
During the first day of the Vietnamese New Year (Tet), January 31, 1968, the Viet Cong (VC) launch ferocious assaults on American and South Vietnamese throughout South Vietnam. This event was seen as the major defeat for the Viet Cong. Even with enormous VC casualties, this episode had a strong impact on the American public, contradicting the idea popularized by American commanders that the war was going well. Magazines ran anti-war editorials, Johnson's popularity declined and civil rights leaders positioned against the always growing was expenditures.