January 21, 1968 – July 9, 1968
North Vietnamese forces besiege the US Marine base at Khe Sanh in Quảng Trị; US forces abandon the base in July.
North Vietnamese and Viet Cong forces attack more than 100 cities and towns in the South; despite heavy losses, the offensive erodes US public support for the war.
US soldiers of Charlie Company kill hundreds of unarmed civilians at Sơn Mỹ, Quảng Ngãi; the killings become public in 1969.
Martin Luther King Jr. is shot dead at the Lorraine Motel in Memphis, Tennessee, triggering riots in many American cities.
Indonesia, Malaysia, the Philippines, Singapore and Thailand sign the Bangkok Declaration, founding the Association of Southeast Asian Nations.
Neil Armstrong and Buzz Aldrin become the first humans to walk on the Moon.
Hồ Chí Minh, President of North Vietnam, dies in Hanoi.