 Nyorai kupfuurira kweiyi ndima - Muna 1963, kusagutsikana kwechiBuddha nehurumende yeKaturike yaDiệm kwakaputika kuva kuratidzira kukuru, kuchitungamirira kumhirizhonga yehurumende. Ikoku kwakatungamirira kukuparara kwoukama hwaDiệm neUnited States, uye pakupedzisira ku 1963 coupumo iye naNhu vakaurawa. Nguva yaDiệm yakateverwa nehurumende dzinodarika gumi nemaviri dzemauto dzakabatana, pamberi pekubatana kweAir Marshal Nguyễn Cao Kỳ naGeneral Nguyễn Văn Thiệu vakatora kutonga pakati pa1965. Thiệu zvishoma nezvishoma akakunda Kỳ uye akasimbisa simba rake musarudzo dzokunyepedzera muna 1967 na1971. Mukati mokusagadzikana kwezvamatongerwe enyika uku, vaKomonisiti vakatanga kuwana nzvimbo. Kutsigira kurwisana kweSouth Vietnam nokumukira kwechiKomonisiti, United States yakatanga kuwedzera mupiro wayo wevanopa mazano ezvombo, ichishandisa chinoitika cha1964 cheGulf of Tonkin sechikonzero chokupindira kwakadaro. Mauto eU.S. akabatanidzwa mumibato yokurwisana pasi pano pakazosvika muna 1965, uye pakakwirira pawo makore anoverengeka gare gare, akaverengwa anopfuura 500 000. US yakabatanidzwawo munhimbe yebhomba remhepo inopfuurira. Munguvayi, China neSoviet Union zvakagovera North Vietnam betsero inokosha yokunyama navapi vezano vokurwa 15 000. Mauto echikomonisiti aipa maVietcong zvaaida aitakura achitevedza nzira yeHồ Chí Minh, iyo yaipfuura nomuLaos. 