Ọ bụ ezie na US maara banyere ebe mgbaba PAVN / Viet Cong na Cambodia kemgbe 1966, Onye isi ala Lyndon B. Johnson ahọrọghị ịwakpo ha n'ihi na enwere ike ịba mba ụwa na nkwenye ya na a ga-eme ka Sihanouk gbanwee usoro ya. Otú ọ dị, Johnson nyere ikike ka ndị ọrụ nyocha nke ndị ọrụ enyemaka nke ndị agha, Vietnam Studies and Observations Group (SOG) banye Cambodia ma kpokọta ọgụgụ isi na mpaghara Base na 1967. Nhọrọ nke Richard M. Nixon na 1968 na iwebata usoro iwu ya nke ịpụpụ US na South Vietnam na Vietnamization nke esemokwu ahụ, ihe niile gbanwere. Ajụjụ: Mgbe a họpụtara Nixon?
Afọ 1968