(i) The prolongation of U.S. war with Vietnam created a strong reaction within the U.S. It was clear that U.S. had failed to achieve its objectives.
(ii) Vietnamese resistance had not been crushed. The government had lost the support of people.
(iii) Thousands of young U.S. soldiers had lost their lives. Many became disillusioned with what U.S. was doing and eminent scholars and writers considered it as the greatest threat to peace, national self-determination, and international cooperation.
(iv) The government of the U.S. was blamed not only by its own people but by most of the world governments.
