Which caught the united states by surprise in 1968, in the midst of the vietnam war? the tet offensive attacks the gulf of tonkin incident the use of agent orange the overthrow of president diem

The correct answer is A) the Tet offensive attacks.

The incident that caught the United States by surprise in 1968, in the midst of the Vietnam War was the Tet offensive attacks.

In January 1968, the Viet Cong and North Vietnam Army attacked several positions of South Vietnam. Many people from the United States Army and the South Vietnam Army died. When United States citizen knew about the attack, they began to question the US participation in that war and the public support for the war diminished. So yes, the incident that caught the United States by surprise in 1968, in the midst of the Vietnam War was the Tet offensive attacks.