"The Soviet Union hastened to endorse the Bandung principles, and the United States began to ease its hostility toward nonalignment (which Secretary of State John Foster Dulles had denounced as "morally bankrupt"), acknowledge the diminishing appeal of its security pacts, and court independent Third World governments. Vietnam was an exception. The Eisenhower administration, which had refused to sign the Geneva Accords, feared a communist victory in the national elections and a domino effect throughout Southeast Asia. After the French withdrawal, the United States proceeded to build up a client state in the south, allowing President Ngô Đình Diệm to cancel the 1956 elections and to clamp down on his opponents. Contrary to the Geneva Accords, which forbade the Vietnamese from entering foreign alliances or allowing foreign troops into Vietnam, Dulles mobilized the US-led Southeast Asia Treaty Organization to agree to protect South Vietnam against communist aggression. When a popular insurgency, which Diệm contemptuously labeled Viet Cong (Vietnamese communists) erupted in the south two years later and received support from the north, Eisenhower expanded US economic and military aid and personnel on the ground. Between 1955 and 1961 the United States poured more than $1 billion in economic and military aid into the Diệm regime, and by the time Eisenhower left office there were approximately one thousand US military advisers in South Vietnam."